[Tweeters] Birdsong CDs?

[as]

I am reviewing my bird songs and I am looking for instructional CDs similar to Peterson's Birding by Ear, which I already have.  Specifically, I'm looking for something which describes songs and compares and contrasts similar songs.  I have plenty CDs with songs on them, Stokes, Peterson, etc, I am looking for the instructional information.  Any suggestions?

Thanks!

Nancy Williams
Liberty Lake


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