I don't no where i made mistake
DETAIL.HTML
{% extends 'music/base.html'%}
<title>{% block title %}Album detail{%endblock%}</title>
{% block body %}
<div class="container-fulid songs-container">
<div class="row">
<div class="col-sm-4 col-md-3">
<div class="panel panel-default">
<div class="panel-body">
<div class="thumbnail">
<a href="{% url 'music:detail' album.id %}">
{% if album.album_logo %}
<img src="{{album.album_logo.url}}">
{% else %}
<h3>no images to display</h3>
{% endif %}
</a>
<h1>{{album.album_title}}<small>{{album.genre}}</small></h1>
<h3>{{album.artist}}</h3>
<h4>{{album.genre}}</h4>
</div>
</div>
</div>
</div>
<!-- Right song info-->
<div class="col-sm-8 col-md-9">
<ul class="nav nav-pills" style="margin-buttom:10px;">
<li role="presentation" class="active"><a href="#">View All</a></li>
<li role="presentation" class="active"><a href="{% url 'music:song-add' album.id %}">Add new Song</a></li>
</ul>
<div class="panel panel-default">
<div class="panel-body">
<h3>All Songs</h3>
<table class="table">
<thead>
<tr>
<th>Title</th>
<th>Audio File</th>
<th>Favorite</th>
<th>Actions</th>
</tr>
</thead>
<tbody>
{% for song in album.song_set.all%}
<tr>
<td>
{{song.song_title}}
</td>
<td>
<a target="_blank" href="{% url 'music:index'%}">
<button type="button" class="btn btn-success btn-xs">
<span class="glyphicon glyphicon-play"></span> Play
</button>
</a>
</td>
<td>
<a href="" class="btn-favorite"><span class="glyphicon glyphicon-star"></span></a>
</td>
<td>
<form action="{% url 'music:song-delete' album.id %}" method="post" style="display: inline;">
{% csrf_token %}
<input type="hidden" name="song_id" value="" />
<button type="submit" class="btn btn-danger btn-xs">
<span class="glyphicon glyphicon-remove"></span> Delete
</button>
</form>
</td>
</tr>
{% endfor%}</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
</div>
{% endblock %}
URLS.py
from django.conf.urls import include, url
from music import views
app_name = 'music'
urlpatterns = [
#this music url
url(r'^$', views.IndexView.as_view(), name='index'),
#registration form
url(r'^register/$', views.UserFormView.as_view(), name='register'),
#this music/detail(album_id)
url(r'^(?P<pk>[0-9]+)/$', views.DetailView.as_view(), name='detail'),
url(r'album/add/$',views.AlbumCreate.as_view(), name='album-add'),
#this music/id/is_favorite
#url(r'^(?P<album_id>[0-9]+)/favorite/$', views.favorite, name='favorite'),
# music/album/2
url(r'^album/(?P<pk>[0-9]+)/$',views.AlbumUpdate.as_view(), name='album-update'),
#music/album/2
url(r'^album/(?P<pk>[0-9]+)/delete/$',views.AlbumDelete.as_view(), name='album-delete'),
#music/album/song/
url(r'^song/add/(?P<album_id>[0-9]+)/$', views.SongCreate.as_view(), name="song-add"),
#music/album/song/
#url(r'^song/(?P<song_id>[0-9]+)/delete/$',views.SongDelete.as_view(), name="song-delete"),
]