Добавил недостающие шаблоны, добавил related_name в моделях, добавил недостающие urls

music_storage/music/models.py

@@ -10,7 +10,7 @@ class Artist(BaseModel):
 
 
 class Album(BaseModel):
-    artist = models.ForeignKey(Artist, on_delete=models.CASCADE)
+    artist = models.ForeignKey(Artist, on_delete=models.CASCADE, related_name="albums")
     name = models.CharField(max_length=200)
 
     def __str__(self):
@@ -19,7 +19,7 @@ class Album(BaseModel):
 
 class Track(BaseModel):
     title = models.CharField(max_length=200)
-    album = models.ForeignKey(Album, blank=True, null=True, default=None, on_delete=models.SET_DEFAULT)
+    album = models.ForeignKey(Album, on_delete=models.CASCADE, related_name="tracks")
     file = models.FileField(upload_to="music/")
 
     def __str__(self):