what is the piece of music that plays as he finally walks across the towers

its bugging the hell out of me, its so famous im sure.

it starts with just three piano donks (tenchincal terms will be used, try to keep up)

like....(quite high pitched) boum..(higher)boum.(bit lower)boum..then a bit of a pause..boum boum boum boum boum...pause...and a bit more..

can anyway pick a song out of that mess?