I have enjoyed using the bird song CD's from the Oh. Div of Nat Res.  
There are four: Warblers of Ohio & Eastern North America, Waterbirds of 
Ohio, Owls of Ohio, and Common Birds of Ohio.  You can get them for free 
by calling 1-800-WILDLIFE.  Each song is preceded by a voice announcing 
the species of bird.  I use the free program WavePad Sound Editor to edit 
out the announcer's voice.  Then load the songs into iTunes on my computer 
and sync to my iPod.
Hope this helps.

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