I'm posting this for my mom because I know she'll dig this. A short video showing a hermit thrush singing from the folks over at Music of Nature. If you know what a hermit thrush sounds like, I know you'll listen, if you haven't--YOU MUST WATCH AND LISTEN. It's a moral imperative--for realzies. C'mon, the bird harmonizes with itself, you know you want to listen:

[youtube]http://www.youtube.com/watch?v=w9vHS6JdHog[/youtube]