The National Audubon CD on North American Birds is excellent in most
parts. I have been extremely disappointed in the bird songs, however.
Many are so distorted as to be useless. I sent one back and the
replacement is just as bad. I tried it on three different platforms;
the problem persists. Check out the House Finch and Golden Crowned
Sparrow for examples of this.

Contact with Random House, the publisher, gave me a "we're sorry"
response but nothing else.