Bird Geniuses
In Birds as Individuals, which I've written about before here, Len Howard has made a careful study of the songs composed by the birds in her garden. In particular she hails the blackbird as an 'imaginative genius' for its compositions, and makes notations of the tunes:
Bullfinches are also talented composers:
And she even includes a diagram of the wood warbler's song:
It seems you can still buy Birds as Individuals, here