Contact (Carl Sagan's musings about religion's role vs science's role in society)
Wall Street ("Greed is good"; until it becomes all consuming)
Apocalypse Now! (a modernization of "Heart of Darkness")
The Sweet Hereafter
Bob Roberts
All songs from Bob Roberts were written by Tim Robbins. He refused to release a soundtrack since the songs would be mis-used by political opponents so some people have stitched them together out of the movie:
https://www.youtube.com/watch?v=tMRXXOvY6kM
Speaking of Tim, honourable mention to Shawshank.