Use this. I was very dubious but it actually worked for the one I tried. http://www.bored.com/songtapper/
Shazam is all well and good if the song is playing, I would guess it is rather less effective if I sing or hum to it.
That's excellent HorTs. You have no idea how useful this is. Shazam is rubbish for hummed or self sang songs
I found it dreadfully inadequate - after 17 tries is still fell woefully short of identifying Rock Me Amadeus by Falco. Am feeling very let down.