>>What would be good tapes or CD's to
>>recommend for (a) someone just beginning, and for (b) someone who has
>>something more than a beginner's knowledge and wants to move to the next
I love the recordings by Lang Elliot, NatureSound Studio.
The sound is incredibly clean and pure, and the recordings last longer and
give you more to think about than the Peterson's CD.
For beginners and intermediate, check out
Common Birds and Their Songs
Know Your Bird Sounds
Stokes Field Guide to Bird Songs
I also love the CDs in this series:
They are not birding CDs per se -- they are long, truly amazing recordings
taken in the field -- but the liner notes tell you what you're hearing in
each track. The swamp CD, for example, has some wonderful barred owl duets,
and prairie spring contains a gorgeous bittern track and a prairie chicken
lek that just about knocks my socks off every time I listen to it. I find
these not only relaxing for me, but great fun to play for my kids.