Chickadee song

I love birds, but I'm no birder. In the spring, there's a particular song that just makes me think of spring. I didn't know what it was, but thanks to Tony Phillips of SUNY Stonybrook's math department, now I do. It's the song of the Black-capped Chickadee. This is distinct from the call of the Chickadee (the familiar chick-a-dee-dee-dee).