I was watching The Sting the other night and it occurred to me that you cannot here that song without associating it with the movie. So I got to thinking of other songs like that. The top 5 I could come up with are (in no order):
(1) The Sting
(2) The Jaws music
(4) The score from the Godfather
(5) Star Wars
For actual "radio" playing songs I cannot here Layla and not think of Goodfellas and the same is true for Eye of the Tiger and Rocky III.