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In [9]: bands = Band.objects.all()

In [10]: for band in bands:
    ...:     albums = band.album_set.all()
    ...:     if len(albums) > 0:
    ...:         print("albums for band", band.name)
    ...:         for album in albums:
    ...:             print("  album:", album.title)

In [11]: albums = Album.objects.all()


In [12]: for album in albums:
    ...:     print("album :", album.title)
    ...:     songs = album.song_set.all()
    ...:     for song in songs:
    ...:         print("  song:", song.title)