Top Gun, not Dirty Dancing.
“Good Night, Sweetheart” from Three Men and a Baby, even though I really don’t like that flick.
Ditto and double ditto.
I can recall the scene from the movie if I make an effort to do so, but my normal association with that song is “Nature Boy” Ric Flair’s ring entrance…
WOOOOOOOOOOOOOO!
“Goodbye Horses”, Q. Lazarus – The Silence of the Lambs (and, recently, Clerks II)
“Head over Heels”, Tears for Fears – Donnie Darko
“The Killing Moon”, Echo & The Bunnymen – " "
Do you mean that “Woo-hoo” song they use in the Vonage ads? Yeah, that one is catchy.
A good one for me is “Danger Zone” from Top Gun.
Also, Land of a Thousand Dances (IIRC) from Ferngully.
Not ONE ghostbusters mention? We all know the song sucked big time, but when somebody mentions the movie, you just have to think of “when there’s something strange…in the neighborhood” the song is too aweful to forget 
On a more classical note, Mozart’s Grand Partita is now indelibly linked with Amadeus, far moreso than any of the other large amount of Mozart music used in the film.
On a less classical note, every time I hear the song Are you ready for the sex, Girls?, I think of Revenge of the Nerds. Of course, the only times in my life I’ve ever heard that song have been while watching that movie, so it’s kind of true by definition.
Uh, okay. Wrestling?
Yup. Ya gotta walk that aisle, styling and profiling like only the Nature Boy can do…
WOOOOOOOOOOO!
Lynyrd Skynyrd’s Tuesday’s Gone, during the scene in Dazed and Confused when the party is over and everybody’s going home. That was the perfect song for the perfect scene, and now they will be forever entwined in my brain.
Funny, I think of it from Last American Virgin!
The Journey of the Sorcerer by the Eagles; The Hitchhiker’s Guide to the Galaxy
Ride of the Valkyries by Wagner; Apocalypse Now (also any Bugs Bunny cartoon with Elmer Fudd singing “Kill the waaa-bit, kill the waaaaa-bit!”)
Everybody Wants Some by Van Halen; Better Off Dead
the entire Rocky Horror Picture Show soundtrack 
Being a girly girl, I’ll claim justifiable ignorance then.
Stephen Foster’s Beautiful dreamer always evokes Mighty Joe Young. i love it – romantic music makes me think of a giant Ape. Movies have warped me.
And the William Tell Overture is inextricably linked with The Lone Ranger and, in a different part, Warner Brothers cartoons.
Because of Fantasia, Bach’s Toccata and Fugue in D Minor is associated with surreal animated images. Several other musical pieces they used haven’t been affected in this way, but The Sorceror’s Apprentice I’ve nly heard there, so it’s clearly linked to Mickey Mouse in my mind. And Dance of the Hours gets linked to either dancing hippos or Alan Sherman’s letter from camp.
Whenever I hear "Inna-gadda-da-vida"by Iron Butterfly I imagine William Peterson jumping through a plate glass window.
Whenever I hear the beginning of “Gimme Some Loving” by Spencer Davis Group, the first words out of my mouth are usually “That ain’t no Hank Williams song!”
Whenever I heard the delicate, haunting first movement of Beethoven’s Piano Concerto No 5, I would always think of Picnic at Hanging Rock and the girls in their white dresses climbing up the rock to meet their mysterious fate.
So, when I bought the DVD of this movie about a month ago and watched it again for the first time in years, I was confused… there were the girls going up the rock, but the music accompanying them to their mysterious fate was Zamfir’s pan flute, and not Beethoven at all.
As it turns out, this piece is used later on in the movie, although not at the crucial girls’ disappearance scene. I was relieved to know that my musical associations were not completely out of whack after all.
Since seeing just the ad campaign for World Trade Center, I think I will always associate Coldplay’s “Fix You” with September 11, 2001.
“Killing Me Softly” by Roberta Flack was completely ruined for me by the singing of it by the kid in About A Boy. Damn, I usta like that song…