John Williams, the famous American composer and conductor has made no small fortune off of music for films. He has also composed music for the Olympics. You might remember the themes for the 1996 and 2002 Olympics held in Atlanta and Salt Lake City respectively. He also did the music for the NBC Nightly News as well. Unfortunately, time constraints being what they are, you never do get to hear the whole piece.
Here is John Williams conducting an orchestra at the Sony Studios in Culver City, CA in a performance of The Mission.