Watching the Olympics and I keep hearing this in the background
The brilliant Chariots of Fire score from Vangelis.
Then there is the classic
By John Williams I heard Spielberg in an interview, John Williams was new in Hollywood at that time and recommended to Spielberg by George Lucas. He said John entered my office to present the score. He sat down at the piano and start hammering out 2 keys. I thought the guy was nuts and wanted him to leave. But he kept saying can you not hear it. It was only when he left I got it and it became the shark we couldn't show.
And my favourite
By John Murphy from IMO the hugely underrated film Danny Boyle's Sunshine, you probably heard this score in Kickass as well.