diff --git a/marietje/marietje/utils.py b/marietje/marietje/utils.py
index 2c78de5..c5607bb 100644
--- a/marietje/marietje/utils.py
+++ b/marietje/marietje/utils.py
@@ -9,7 +9,9 @@ def song_to_dict(song, hash=False, user=False):
         'id': song.id,
         'artist': song.artist,
         'title': song.title,
-        'duration': song.duration
+        'duration': song.duration,
+        'rg_gain': song.rg_gain,
+        'rg_peak': song.rg_peak,
     }
 
     if hash:
diff --git a/marietje/playerapi/urls.py b/marietje/playerapi/urls.py
index 9b2f101..6158a35 100644
--- a/marietje/playerapi/urls.py
+++ b/marietje/playerapi/urls.py
@@ -8,4 +8,5 @@ urlpatterns = [
     url(r'^queue', views.queue),
     url(r'^play', views.play),
     url(r'^next', views.next),
+    url(r'^analysed', views.analysed),
 ]
diff --git a/marietje/playerapi/views.py b/marietje/playerapi/views.py
index 1136574..f3f3786 100644
--- a/marietje/playerapi/views.py
+++ b/marietje/playerapi/views.py
@@ -6,6 +6,7 @@ from django.views.decorators.csrf import csrf_exempt
 
 from marietje.utils import playlist_song_to_dict
 from queues.models import Queue
+from songs.models import Song
 
 from .decorators import token_required
 
@@ -44,3 +45,23 @@ def next(request):
     player_song.state = 2
     player_song.save()
     return JsonResponse({})
+
+@csrf_exempt
+@token_required
+def next(request):
+    queue = get_object_or_404(Queue, id=request.POST.get('queue'))
+    player_song = queue.current_song()
+    player_song.state = 2
+    player_song.save()
+    return JsonResponse({})
+
+@csrf_exempt
+@token_required
+def analysed(request):
+    song = get_object_or_404(Song, id=request.POST.get('song'))
+    if 'gain' in request.POST:
+        song.rg_gain = request.POST.get('gain')
+    if 'peak' in request.POST:
+        song.rg_peak = request.POST.get('peak')
+    song.save()
+    return JsonResponse({})
diff --git a/marietje/songs/migrations/0002_replaygain.py b/marietje/songs/migrations/0002_replaygain.py
new file mode 100644
index 0000000..c7a3f5d
--- /dev/null
+++ b/marietje/songs/migrations/0002_replaygain.py
@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.5 on 2017-09-18 12:14
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('songs', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='song',
+            name='rg_gain',
+            field=models.DecimalField(blank=True, decimal_places=6, help_text='replaygain gain level', max_digits=9, null=True),
+        ),
+        migrations.AddField(
+            model_name='song',
+            name='rg_peak',
+            field=models.DecimalField(blank=True, decimal_places=6, help_text='replaygain peak level', max_digits=9, null=True),
+        ),
+        migrations.AlterField(
+            model_name='song',
+            name='duration',
+            field=models.IntegerField(help_text='track duration in seconds'),
+        ),
+    ]
diff --git a/marietje/songs/models.py b/marietje/songs/models.py
index f0e23d3..0c25de7 100644
--- a/marietje/songs/models.py
+++ b/marietje/songs/models.py
@@ -12,7 +12,11 @@ class Song(models.Model):
     artist = models.TextField()
     title = models.TextField()
     hash = models.TextField()
-    duration = models.IntegerField()
+    duration = models.IntegerField(help_text="track duration in seconds")
+    rg_gain = models.DecimalField(max_digits=9, decimal_places=6,
+        blank=True, null=True, help_text="replaygain gain level")
+    rg_peak = models.DecimalField(max_digits=9, decimal_places=6,
+        blank=True, null=True, help_text="replaygain peak level")
     old_id = models.TextField(blank=True, null=True, default=None)
     deleted = models.BooleanField(default=False)