The RSPB bird guide has bird song clips on the ID page of each bird.

The RSPB: Birds by name

This is one of the main books with cds, probably the one Flums budgie prefers!

Amazon.co.uk: Collins Field Guide: Bird Songs and Calls of Britain and Northern Europe (Contains 2 accompanying CDs): Geoff Sample: Books

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Manda.

"Wouldn't it be nice
For maybe an hour
To not have a care."