I grew up in a rural area and became accustomed to a chorus of birds coaxing me out of bed in the mornings. While never introduced to proper bird watching, I do enjoy my fair share of observation and listening. Here's a wonderful resource to acquaint yourself (or your children or students) with the chirps and their composers:
"Common Birds and their Songs" by Lang Elliott and Marie Read includes descriptions, full-page photos, and audio tracks for fifty common birds in North America. It's an incredible resource!
Thanks for reading :)