Lyric discussion by madame 

yeah this is about a bird she used to have who is now dead. she said so in one of her concerts. youtube.com/watch it's amazing but actually the chorus is a ripoff of "lullaby of birdland" by Fitzgerald

@madame it's not a "ripoff," how dare you? If you listened to any of Winehouse's stuff you'd know she has a lot of originality and talent to make her own songs which is in fact what she did for ALL of them. The chorus was that way on purpose, notice she mentions Sarah Vaughan who was a jazz artist, she sang "lullaby of bidland" too and her manager after her divorce with her husband rebirth as an artist in the 70s became her lover. This suggests that the song is about depression caused by a relationship that's over. Amy...

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