Bird Songs, Eastern US Region

I just purchased a CD set of bird songs which I recommended years ago on my blog -- lent to me by a friend after a birdwatching nature walk which she led my children and I on when we were homeschoolers. Now that we are studying Audubon in the classroom, I thought it would be a good purchase for the school. This is for the Eastern region of the US.

Stokes Field Guide to Bird Songs: Eastern Region