hef ekki prufað þetta almennilega en þeta virkar á sum lög :)

http://www.songtapper.com

“This site lets you search for a song, by tapping the rhythm of its words (lyrics).

Let's say you have a song stuck in your head, and you don't know the name of it. Never fear! Load up our search screen, and try tapping the rhythm of the song on your space bar while humming the tune. Tap the space bar for each syllable that you sing. It's that simple!”