I like this idea.

You hum a tune into the computer microphone for 10-15 seconds, a clever bit of software from Nayio.com will match your attempt to Napster’s library of music. They will get a free listen to the song and will also be able to buy the tune from Napster.

I am off to try it out. Will let you know if it works. I think it goes like this…Ummm um umm uum umm la la la ummm