I have problem in when submitting song_form

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>&nbsp; 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>&nbsp; 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"),
]

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