diff --git a/cms/models.py b/cms/models.py
index fcd0d0e..ba65c57 100644
--- a/cms/models.py
+++ b/cms/models.py
@@ -414,6 +414,9 @@ class DiffusionPage(Publication):
         related_name = 'page',
         on_delete=models.SET_NULL,
         null=True,
+        limit_choices_to = {
+            'initial__isnull': True,
+        },
     )
 
     class Meta:
@@ -423,7 +426,7 @@ class DiffusionPage(Publication):
     content_panels = [
         FieldPanel('diffusion'),
     ] + Publication.content_panels + [
-        InlinePanel('tracks', label=_('Tracks'))
+        InlinePanel('tracks', label=_('Tracks')),
     ]
 
 
diff --git a/cms/sections.py b/cms/sections.py
index 1a90c03..fec4362 100644
--- a/cms/sections.py
+++ b/cms/sections.py
@@ -890,8 +890,8 @@ class SectionLogsList(SectionItem):
 @register_snippet
 class SectionTimetable(SectionItem,DatedListBase):
     class Meta:
-        verbose_name = _('timetable')
-        verbose_name_plural = _('timetable')
+        verbose_name = _('Section: Timetable')
+        verbose_name_plural = _('Sections: Timetable')
 
     panels = SectionItem.panels + DatedListBase.panels
 
@@ -914,8 +914,8 @@ class SectionTimetable(SectionItem,DatedListBase):
 @register_snippet
 class SectionPublicationInfo(SectionItem):
     class Meta:
-        verbose_name = _('section with publication\'s info')
-        verbose_name = _('sections with publication\'s info')
+        verbose_name = _('Section: publication\'s info')
+        verbose_name_plural = _('Sections: publication\'s info')
 
 @register_snippet
 class SectionSearchField(SectionItem):
@@ -933,8 +933,8 @@ class SectionSearchField(SectionItem):
     )
 
     class Meta:
-        verbose_name = _('search field')
-        verbose_name_plural = _('search fields')
+        verbose_name = _('Section: search field')
+        verbose_name_plural = _('Sections: search field')
 
     panels = SectionItem.panels + [
         PageChooserPanel('page'),
@@ -946,6 +946,32 @@ class SectionSearchField(SectionItem):
         context = super().get_context(request, page)
         list_page = self.page or ListPage.objects.live().first()
         context['list_page'] = list_page
-        print(context, self.template)
         return context
 
+
+@register_snippet
+class SectionPlayer(SectionItem):
+    live_title = models.CharField(
+        _('live title'),
+        max_length = 32,
+        help_text = _('text to display when it plays live'),
+    )
+    streams = models.TextField(
+        _('audio streams'),
+        help_text = _('one audio stream per line'),
+    )
+
+    class Meta:
+        verbose_name = _('Section: Player')
+
+    panels = SectionItem.panels + [
+        FieldPanel('live_title'),
+        FieldPanel('streams'),
+    ]
+
+    def get_context(self, request, page):
+        context = super().get_context(request, page)
+        context['streams'] = self.streams.split('\r\n')
+        return context
+
+
diff --git a/cms/static/cms/js/player.js b/cms/static/cms/js/player.js
new file mode 100644
index 0000000..144b576
--- /dev/null
+++ b/cms/static/cms/js/player.js
@@ -0,0 +1,280 @@
+// TODO
+// - multiple sources for an item
+// - live streams as item;
+// - add to playlist button
+//
+
+/// Return a human-readable string from seconds
+function duration_str(seconds) {
+    seconds = Math.floor(seconds);
+    var hours = Math.floor(seconds / 3600);
+    seconds -= hours;
+    var minutes = Math.floor(seconds / 60);
+    seconds -= minutes;
+
+    var str = hours ? (hours < 10 ? '0' + hours : hours) + ':' : '';
+    str += (minutes < 10 ? '0' + minutes : minutes) + ':';
+    str += (seconds < 10 ? '0' + seconds : seconds);
+    return str;
+}
+
+
+function Sound(title, detail, stream, duration) {
+    this.title = title;
+    this.detail = detail;
+    this.stream = stream;
+    this.duration = duration;
+}
+
+Sound.prototype = {
+    title: '',
+    detail: '',
+    stream: '',
+    duration: undefined,
+
+    item: undefined,
+
+    get seekable() {
+        return this.duration != undefined;
+    },
+}
+
+
+function PlayerPlaylist(player) {
+    this.player = player;
+    this.playlist = player.player.querySelector('.playlist');
+    this.item_ = player.player.querySelector('.playlist .item');
+    this.items = []
+}
+
+PlayerPlaylist.prototype = {
+    items: undefined,
+
+    find: function(stream) {
+        return this.items.find(function(v) {
+            return v.stream == item;
+        });
+    },
+
+    add: function(sound, container) {
+        if(this.find(sound.stream))
+            return;
+
+        var item = this.item_.cloneNode(true);
+        item.removeAttribute('style');
+
+        console.log(sound)
+        item.querySelector('.title').innerHTML = sound.title;
+        if(sound.seekable)
+            item.querySelector('.duration').innerHTML =
+                duration_str(sound.duration);
+        if(sound.detail)
+            item.querySelector('.detail').href = sound.detail;
+
+        item.sound = sound;
+        sound.item = item;
+
+        var self = this;
+        item.querySelector('.action.remove').addEventListener(
+            'click', function(event) { self.remove(sound); }, false
+        );
+
+        (container || this.playlist).appendChild(item);
+        this.items.push(sound);
+        this.save();
+    },
+
+    remove: function(sound) {
+        var index = this.items.indexOf(sound);
+        if(index != -1)
+            this.items.splice(index,1);
+        this.playlist.removeChild(sound.item);
+        this.save();
+    },
+
+    save: function() {
+        var list = [];
+        for(var i in this.items) {
+            var sound = Object.assign({}, this.items[i])
+            delete sound.item;
+            list.push(sound);
+        }
+        this.player.store.set('playlist', list);
+    },
+
+    load: function() {
+        var list = [];
+        var container = document.createDocumentFragment();
+        for(var i in list)
+            this.add(list[i], container)
+        this.playlist.appendChild(container);
+    },
+}
+
+
+function Player(id) {
+    this.store = new Store('player');
+
+    // html items
+    this.player = document.getElementById(id);
+    this.box = this.player.querySelector('.box');
+    this.audio = this.player.querySelector('audio');
+    this.controls = {
+        duration: this.box.querySelector('.duration'),
+        progress: this.player.querySelector('progress'),
+        single: this.player.querySelector('input.single'),
+    }
+
+    this.playlist = new PlayerPlaylist(this);
+    this.playlist.load();
+
+    this.init_events();
+    this.load();
+}
+
+Player.prototype = {
+    /// current item being played
+    sound: undefined,
+
+    init_events: function() {
+        var self = this;
+
+        function time_from_progress(event) {
+            bounding = self.controls.progress.getBoundingClientRect()
+            offset = (event.clientX - bounding.left);
+            return offset * self.audio.duration / bounding.width;
+        }
+
+        function update_info() {
+            var controls = self.controls;
+            // progress
+            if( !self.sound.seekable ||
+                    self.audio.duration == Infinity) {
+                controls.duration.innerHTML = '';
+                controls.progress.value = 0;
+                return;
+            }
+
+            var pos = self.audio.currentTime;
+            controls.progress.value = pos;
+            controls.progress.max = self.audio.duration;
+            controls.duration.innerHTML = duration_str(sound.duration);
+        }
+
+        // audio
+        this.audio.addEventListener('playing', function() {
+            self.player.setAttribute('state', 'playing');
+        }, false);
+
+        this.audio.addEventListener('pause', function() {
+            self.player.setAttribute('state', 'paused');
+        }, false);
+
+        this.audio.addEventListener('loadstart', function() {
+            self.player.setAttribute('state', 'stalled');
+        }, false);
+
+        this.audio.addEventListener('loadeddata', function() {
+            self.player.removeAttribute('state');
+        }, false);
+
+        this.audio.addEventListener('timeupdate', update_info, false);
+
+        this.audio.addEventListener('ended', function() {
+            if(!self.controls.single.checked)
+                self.next(true);
+        }, false);
+
+        // buttons
+        this.box.querySelector('button.play').onclick = function() {
+            self.play();
+        };
+
+        // progress
+        progress = this.controls.progress;
+        progress.addEventListener('click', function(event) {
+            player.audio.currentTime = time_from_progress(event);
+        }, false);
+
+        progress.addEventListener('mouseout', update_info, false);
+
+        progress.addEventListener('mousemove', function(event) {
+            if(self.audio.duration == Infinity)
+               return;
+
+            var pos = time_from_progress(event);
+            self.controls.duration.innerHTML = duration_str(pos);
+        }, false);
+    },
+
+    play: function() {
+        if(this.audio.paused)
+            this.audio.play();
+        else
+            this.audio.pause();
+    },
+
+    unselect: function(sound) {
+        sound.item.removeAttribute('selected');
+    },
+
+    select: function(sound, play = true) {
+        if(this.sound)
+            this.unselect(this.sound);
+
+        this.audio.pause();
+
+        // if stream is a list, use <source>
+        if(sound.stream.splice) {
+            this.audio.src="";
+
+            var sources = this.audio.querySelectorAll('source');
+            for(var i in sources)
+                this.audio.removeChild(sources[i]);
+
+            for(var i in sound.stream) {
+                var source = document.createElement('source');
+                source.src = sound.stream[i];
+            }
+        }
+        else
+            this.audio.src = sound.stream;
+        this.audio.load();
+
+        this.sound = sound;
+        sound.item.setAttribute('selected', 'true');
+
+        this.box.querySelector('.title').innerHTML = sound.title;
+        if(play)
+            this.play();
+    },
+
+    next: function() {
+        var index = this.playlist.items.indexOf(this.sound);
+        if(index < 0)
+            return;
+
+        index++;
+        if(index < this.playlist.items.length)
+            this.select(this.playlist.items[index], true);
+    },
+
+    save: function() {
+        this.store.set('player', {
+            single: this.controls.single.checked,
+            sound: this.sound && this.sound.stream,
+        });
+    },
+
+    load: function() {
+        var data = this.store.get('player');
+        this.controls.single.checked = data.single;
+        this.sound = this.playlist.find(data.stream);
+    },
+
+    update_on_air: function() {
+
+    },
+}
+
+
diff --git a/cms/static/cms/js/utils.js b/cms/static/cms/js/utils.js
new file mode 100644
index 0000000..a028efb
--- /dev/null
+++ b/cms/static/cms/js/utils.js
@@ -0,0 +1,68 @@
+
+/// Helper to provide a tab+panel functionnality; the tab and the selected
+/// element will have an attribute "selected".
+/// We assume a common ancestor between tab and panel at a maximum level
+/// of 2.
+/// * tab: corresponding tab
+/// * panel_selector is used to select the right panel object.
+function select_tab(tab, panel_selector) {
+    var parent = tab.parentNode.parentNode;
+    var panel = parent.querySelector(panel_selector);
+
+    // unselect
+    var qs = parent.querySelectorAll('*[selected]');
+    for(var i = 0; i < qs.length; i++)
+        if(qs[i] != tab && qs[i] != panel)
+            qs[i].removeAttribute('selected');
+
+    panel.setAttribute('selected', 'true');
+    tab.setAttribute('selected', 'true');
+}
+
+
+/// Utility to store objects in local storage. Data are stringified in JSON
+/// format in order to keep type.
+function Store(prefix) {
+    this.prefix = prefix;
+}
+
+Store.prototype = {
+    // save data to localstorage, or remove it if data is null
+    set: function(key, data) {
+        key = this.prefix + '.' + key;
+        if(data == undefined) {
+            localStorage.removeItem(prefix);
+            return;
+        }
+        localStorage.setItem(key, JSON.stringify(data))
+    },
+
+    // load data from localstorage
+    get: function(key) {
+        try {
+            key = this.prefix + '.' + key;
+            var data = localStorage.getItem(key);
+            if(data)
+                return JSON.parse(data);
+        }
+        catch(e) { console.log(e, data); }
+    },
+
+    // return true if the given item is stored
+    exists: function(key) {
+        key = this.prefix + '.' + key;
+        return (localStorage.getItem(key) != null);
+    },
+
+    // update a field in the stored data
+    update: function(key, field_key, value) {
+        data = this.get(key) || {};
+        if(value)
+            data[field_key] = value;
+        else
+            delete data[field_key];
+        this.set(key, data);
+    },
+}
+
+
diff --git a/cms/templates/cms/base_site.html b/cms/templates/cms/base_site.html
index aa6c86a..11033f3 100644
--- a/cms/templates/cms/base_site.html
+++ b/cms/templates/cms/base_site.html
@@ -25,6 +25,9 @@
             {% block css_extras %}{% endblock %}
         {% endblock %}
 
+        <script src="{% static 'cms/js/utils.js' %}"></script>
+        <script src="{% static 'cms/js/player.js' %}"></script>
+
         <title>{{ page.title }}</title>
     </head>
     <body>
diff --git a/cms/templates/cms/sections/section_player.html b/cms/templates/cms/sections/section_player.html
new file mode 100644
index 0000000..e5feb80
--- /dev/null
+++ b/cms/templates/cms/sections/section_player.html
@@ -0,0 +1,61 @@
+{% extends 'cms/sections/section_item.html' %}
+
+{% load staticfiles %}
+{% load i18n %}
+
+
+{% block content %}
+<style>
+
+
+
+</style>
+<div id="player">
+    <div class="box">
+        <audio preload="metadata">
+            {% trans "Your browser does not support the <code>audio</code> element." %}
+            {% for stream in streams %}
+            <source src="{{ stream }}" />
+            {% endfor %}
+        </audio>
+
+        <button class="play" onclick="Player.play()"
+          title="{% trans "play/pause" %}"></button>
+
+        <h3 class="title">{{ self.live_title }}</h3>
+
+        <div>
+            <div class="info duration"></div>
+            <progress value="0" max="1"></progress>
+
+            <input type="checkbox" class="single" id="player_single_mode">
+            <label for="player_single_mode"></label>
+        </div>
+    </div>
+    <div class="playlist">
+        <li class='item' style="display: none;">
+            <h2 class="title">{{ self.live_title }}</h2>
+            <div class="info duration"></div>
+            <div class="actions">
+                <a class="action detail" title="{% trans "more informations" %}">➔</a>
+                <a class="action remove" title="{% trans "remove this sound" %}">✖</a>
+            </div>
+        </li>
+    </div>
+    <div class='item on_air'>
+        <h2 class="title"></h2>
+        <a class="url">➔</a>
+    </div>
+</div>
+
+<script>
+var player = new Player('player');
+player.playlist.add(new Sound('{{ self.live_title }}', '', [
+    {% for stream in streams %}'{{ stream }}',{% endfor %}
+]));
+
+</script>
+{% endblock %}
+
+
+
diff --git a/cms/templates/cms/snippets/date_list.html b/cms/templates/cms/snippets/date_list.html
index 6408e08..960e553 100644
--- a/cms/templates/cms/snippets/date_list.html
+++ b/cms/templates/cms/snippets/date_list.html
@@ -1,27 +1,5 @@
 {% load i18n %}
 
-<script>
-    /// Function used to select a panel on a tab selection.
-    /// The tab should be at max level -2 of the main container
-    /// The panel must have a class "panel"
-    function select_tab(target) {
-        parent = target.parentNode.parentNode;
-
-        var date = target.dataset.date;
-        panel = parent.querySelector('.panel[data-date="' + date + '"]');
-
-        // unselect
-        qs = parent.querySelectorAll('*[selected]');
-        for(var i = 0; i < qs.length; i++)
-            if(qs[i].dataset.date != date)
-                qs[i].removeAttribute('selected');
-
-        console.log(panel, target, date);
-        panel.setAttribute('selected', 'true');
-        target.setAttribute('selected', 'true');
-    }
-</script>
-
 {# FIXME: get current complete URL #}
 <div class="list date_list">
 {% if nav_dates %}
@@ -31,7 +9,7 @@
     {% endif %}
 
     {% for day in nav_dates.dates %}
-    <a onclick="select_tab(this);" data-date="day_{{day|date:"Y-m-d"}}"
+    <a onclick="select_tab(this, '.panel[data-date=\'{{day|date:"Y-m-d"}}\']');"
         {% if day == nav_dates.date %}selected{% endif %}
         class="tab {% if day == nav_dates.date %}today{% endif %}">
         {{ day|date:'D. d' }}
@@ -47,7 +25,7 @@
 {% for day, list in object_list %}
 <ul class="panel {% if day == nav_dates.date %}class="today"{% endif %}"
     {% if day == nav_dates.date %}selected{% endif %}
-    data-date="day_{{day|date:"Y-m-d"}}">
+    data-date="{{day|date:"Y-m-d"}}">
     {# you might like to hide it by default -- this more for sections #}
     <h2>{{ day|date:'l d F' }}</h2>
     {% with object_list=list item_date_format="H:i" %}
diff --git a/programs/models.py b/programs/models.py
index ce53900..0bb856a 100755
--- a/programs/models.py
+++ b/programs/models.py
@@ -1,4 +1,5 @@
 import datetime
+import calendar
 import os
 import shutil
 import logging
@@ -400,6 +401,18 @@ class Schedule(models.Model):
         date = date_or_default(date, True).replace(day=1)
         freq = self.frequency
 
+        # last of the month
+        if freq == Schedule.Frequency.last:
+            date = date.replace(day=calendar.monthrange(date.year, date.month)[1])
+
+            # end of month before the wanted weekday: move one week back
+            if date.weekday() < self.date.weekday():
+                date -= datetime.timedelta(days = 7)
+
+            delta = self.date.weekday() - date.weekday()
+            date += datetime.timedelta(days = delta)
+            return [self.normalize(date)]
+
         # move to the first day of the month that matches the schedule's weekday
         # check on SO#3284452 for the formula
         first_weekday = date.weekday()
@@ -408,19 +421,9 @@ class Schedule(models.Model):
                                     - first_weekday + sched_weekday)
         month = date.month
 
-        # last of the month
-        if freq == Schedule.Frequency.last:
-            date += tz.timedelta(days = 4 * 7)
-            next_date = date + tz.timedelta(days = 7)
-            if next_date.month == month:
-                date = next_date
-            return [self.normalize(date)]
-
         dates = []
         if freq == Schedule.Frequency.one_on_two:
-            # NOTE previous algorithm was based on the week number, but this
-            # approach is wrong because number of weeks in a year can be
-            # 52 or 53. This also clashes with the first week of the year.
+            # check date base on a diff of dates base on a 14 days delta
             diff = as_date(date, False) - as_date(self.date, False)
             if diff.days % 14:
                 date += tz.timedelta(days = 7)
@@ -445,36 +448,31 @@ class Schedule(models.Model):
         If exclude_saved, exclude all diffusions that are yet in the database.
         """
         dates = self.dates_of_month(date)
-        saved = Diffusion.objects.filter(start__in = dates,
-                                         program = self.program)
         diffusions = []
 
-        duration = utils.to_timedelta(self.duration)
-
         # existing diffusions
-        for item in saved:
+        for item in Diffusion.objects.filter(
+                program = self.program, start__in = dates):
             if item.start in dates:
                 dates.remove(item.start)
             if not exclude_saved:
                 diffusions.append(item)
 
-        # others
-        for date in dates:
-            first_date = date
-            if self.initial:
-                first_date -= self.date - self.initial.date
-
-            first_diffusion = Diffusion.objects.filter(start = first_date,
-                                                       program = self.program)
-            first_diffusion = first_diffusion[0] if first_diffusion.count() \
-                              else None
-            diffusions.append(Diffusion(
-                                 program = self.program,
-                                 type = Diffusion.Type.unconfirmed,
-                                 initial = first_diffusion if self.initial else None,
-                                 start = date,
-                                 end = date + duration,
-                             ))
+        # new diffusions
+        duration = utils.to_timedelta(self.duration)
+        if self.initial:
+            delta = self.date - self.initial.date
+        diffusions += [
+            Diffusion(
+                program = self.program,
+                type = Diffusion.Type.unconfirmed,
+                initial = \
+                    Diffusion.objects.filter(start = date - delta).first() \
+                        if self.initial else None,
+                start = date,
+                end = date + duration,
+            ) for date in dates
+        ]
         return diffusions
 
     def __str__(self):
diff --git a/programs/tests.py b/programs/tests.py
index ce26860..d2f1578 100755
--- a/programs/tests.py
+++ b/programs/tests.py
@@ -1,79 +1,66 @@
 import datetime
+import calendar
+import logging
+from dateutil.relativedelta import relativedelta
 
 from django.test import TestCase
 from django.utils import timezone as tz
 
 from aircox.programs.models import *
 
+logger = logging.getLogger('aircox.test')
+logger.setLevel('INFO')
 
-class Programs (TestCase):
-    def setUp (self):
-        stream = Stream.objects.get_or_create(
-            name = 'diffusions',
-            defaults = { 'type': Stream.Type.schedule }
-        )[0]
-        Program.objects.create(name = 'source', stream = stream)
-        Program.objects.create(name = 'microouvert', stream = stream)
+class ScheduleCheck (TestCase):
+    def setUp(self):
+        self.schedules = [
+            Schedule(
+                date = tz.now(),
+                duration = datetime.time(1,30),
+                frequency = frequency,
+            )
+            for frequency in Schedule.Frequency.__members__.values()
+        ]
 
-        self.schedules = {}
-        self.programs = {}
+    def test_frequencies(self):
+        for schedule in self.schedules:
+            logger.info('- test frequency %s' % schedule.get_frequency_display())
+            date = schedule.date
+            count = 24
+            while count:
+                logger.info('- month %(month)s/%(year)s' % {
+                    'month': date.month,
+                    'year': date.year
+                })
+                count -= 1
+                dates = schedule.dates_of_month(date)
+                if schedule.frequency == schedule.Frequency.one_on_two:
+                    self.check_one_on_two(schedule, date, dates)
+                elif schedule.frequency == schedule.Frequency.last:
+                    self.check_last(schedule, date, dates)
+                else:
+                    pass
+                date += relativedelta(months = 1)
 
-    def test_create_programs_schedules (self):
-        program = Program.objects.get(name = 'source')
+    def check_one_on_two(self, schedule, date, dates):
+        for date in dates:
+            delta = date.date() - schedule.date.date()
+            self.assertEqual(delta.days % 14, 0)
 
-        sched_0 = self.create_schedule(program, 'one on two', [
-                tz.datetime(2015, 10, 2, 18),
-                tz.datetime(2015, 10, 16, 18),
-                tz.datetime(2015, 10, 30, 18),
-            ]
-        )
-        sched_1 = self.create_schedule(program, 'one on two', [
-                tz.datetime(2015, 10, 5, 18),
-                tz.datetime(2015, 10, 19, 18),
-            ],
-            rerun = sched_0
-        )
+    def check_last(self, schedule, date, dates):
+        month_info = calendar.monthrange(date.year, date.month)
+        date = datetime.date(date.year, date.month, month_info[1])
 
-        self.programs[program.pk] = program
+        # end of month before the wanted weekday: move one week back
+        if date.weekday() < schedule.date.weekday():
+            date -= datetime.timedelta(days = 7)
 
-        program = Program.objects.get(name = 'microouvert')
-        # special case with november first week starting on sunday
-        sched_2 = self.create_schedule(program, 'first and third', [
-                tz.datetime(2015, 11, 6, 18),
-                tz.datetime(2015, 11, 20, 18),
-            ],
-            date = tz.datetime(2015, 10, 23, 18),
-        )
+        date -= datetime.timedelta(days = date.weekday())
+        date += datetime.timedelta(days = schedule.date.weekday())
+        self.assertEqual(date, dates[0].date())
+
+    def check_n_of_week(self, schedule, date, dates):
+        pass
 
-    def create_schedule (self, program, frequency, dates, date = None, rerun = None):
-        frequency = Schedule.Frequency[frequency]
-        schedule = Schedule(
-            program = program,
-            frequency = frequency,
-            date = date or dates[0],
-            rerun = rerun,
-            duration = datetime.time(1, 30)
-        )
-        print(schedule.__dict__)
-        schedule.save()
-
-        self.schedules[schedule.pk] = (schedule, dates)
-        return schedule
-
-    def test_check_schedule (self):
-        for schedule, dates in self.schedules:
-            dates = [ tz.make_aware(date) for date in dates ]
-            dates.sort()
-
-            # dates
-            dates_ = schedule.dates_of_month(dates[0])
-            dates_.sort()
-            self.assertEqual(dates_, dates)
-
-            # diffusions
-            dates_ = schedule.diffusions_of_month(dates[0])
-            dates_ = [date_.date for date_ in dates_]
-            dates_.sort()
-            self.assertEqual(dates_, dates)