OK, I have to admit, I've never seen Deer Hunter, Platoon, Goodfellas, Mean Streets, OR Easy Rider. :o
EC, I definitely agree about Scorsese, though - I thought that his use of songs in The Departed was brilliant as well (I'd argue that his placement of Drop Kick Murphies in his movie kickstarted their career again).
Dueling Banjos is CLASSIC.
Newb and Wicker - Good call with the Apocalypse Now scenes - Those definitely come to mind for me when I think about this topic.
V - Love, love, LOVE Pulp Fiction... This also comes to mind: