It sounds like the start of a bad joke, but Midomi is a search engine that purports to find music by having you sing, hum or, if you have the wherewithal, strum a guitar or blow into a trombone. You can also search by typing in the name of the song or artist, but that's oh-so-boring…
I started by clearing my throat and humming Dave Brubeck's "Take Five". The best Midomi could come up with was "House of Bourbon" and Madonna's "Santa Baby". I got no better results whistling the tune. I thought it might be a problem at my end, but whistling after drinking a Sierra Nevada didn't help, either.
I had better luck with "Amazing Grace", the song Midomi uses in its video demo. I found "Amazing Grace" along with a few others, including "The Restroom Door Said, 'Gentleman'" (nope, I'm not kidding) and "Put On a Happy Face" from Bye Bye Birdie. About the only tune they missed was the theme from "It's a Small World". (I'll bet you're stuck humming that now, too, right?)
Overall, it's way too much work, but the idea is certainly intriguing. And it's a great site to blog about.