Tune behind 'Mad World'

I suspect the tune behind the song ‘Mad World’ is actually something older (possibly classical) re-used for that song/lyrics.

p.s. There’s only ever been one tv musical talent show winner that I’ve ever not turned my nose up at and that’s Alex Parks (winner of UK ‘Fame Academy’ last year) I am listening right now to her version of ‘Mad World’.

If you hear the Tears for Fears original, I think you’ll have to admit that you’re probably wrong in your guess.