Tough one alright, as I'm a soundtrack collector.
Well...my faves are:
John Williams: Raiders March (Raiders of the Lost Ark)
John Williams: Scherzo for Motorcycle and Orchestra. (Indy III)
John Williams: Star Wars - Main Theme. (Star Wars)
Ron Goodwin: Battle of Britain Main Theme. (Battle of Britain)
Ron Goodwin: Luftwaffe March (Aces High). (Battle of Britain)
Alan Silvestri: Main Theme. (Back To The Future)
Stereophonics: Long Way Round (Long Way Round)
Mike Curb Congregation: Burning Bridges (Kelly's Heroes)
Henry Mancini: A Shot In The Dark. (A Shot In The Dark)
Bruce Willis Danny Aiello: Swingin' On A Star (Hudson Hawk)
Sting: It's Probably Me (Lethal Weapon)
George Benson: On Broadway. (All That Jazz)
Vangelis: One More Kiss, Dear (Blade Runner)
Rammstein: Feuer Frei. (xXx)
Angelo Badalamenti: Theme - Audrey's Dance - Love Theme - Falling (w. Julee Cruise). (Twin Peaks)
John Barry: The Buffalo Hunt. (Dances With Wolves)
Bernard Herrman: Citizen Kane - the entire cd.
Hans Zimmer Lisa Gerrard: The Battle. (Gladiator)
Neil Diamond: Be. (Jonathan Livingston Seagull)
John Williams: The Raptor Attack and Theme. (Jurassic Park)
Alexander Courage: Main Title. (Star Trek: The Next Generation)
Eric Serra Inva Mullah Tchako: Lucia De Lammermoor The Diva Dance. (The Fifth Eelement)
Michael Kamen: Requiem For A Soldier, Main Theme and Suite One. (Band of Brothers).
Vera Lynn: We'll Meet Again. (Dr. Strangelove)