I was inspired by, I believe, Mecha's thread on top movie franchise entries. I'll preface this by admitting that musical tastes are highly personal. They're heavily influenced by one's personal experiences and are often touchstones for your life experiences. You strongly bond with movies in your youth, romantic endeavors, or when they remind you of something pleasant. I'll also admit that mine are just as individualistic, and therefore limited, as anyone else's.

I want to relate this to a particular, famous movie composer. A century or more ago, one might count classical or concert composers as one's "favorite." Now, movies are conduits for concert music for the masses. As such, I want to focus on the major movie composers of all time and which of their scores you connect with the most. I want to stick with a particular score, and not an album, though we can certainly do that, too. (John Williams would no doubt win that one for me.)

• Basil Poledouris - "Klendathu Drop" (Starship Troopers). I put Poledouris first because I listened to this one recently and I simply cannot get it out of my brain. Others will cite RoboCop or Conan, but this is it for me.
• John Williams - "Desert Chase" (Raiders of the Lost Ark). What, you say? This isn't even a man theme! Yeah, but it has it ALL. It's got Indy's theme, the bad guys' theme, heavy drums, etc. The desert chase is, by far, my favorite action scene in ANY movie. Christ, I miss real stuntmen. Williams pulls out all the stops and uses virtually every section in the symphony (brass, winds, percussion, strings) to insane effect.
• Jerry Goldsmith - "The Dream" (Total Recall) The only movie I've ever seen five times in the theater. Jerry was the most experimental composer I've ever heard, so this is only a tiny fraction of his talent, but I could listen to this one on repeat all day. You'd swear it was a Poledouris score, due to its martial themes, but it's just Jerry being awesome.
• James Horner - "Main Theme" (Krull) Okay, WTF, right?! This movie was made before Horner really went mainstream. But it has echoes of his work on Star Trek--so much of this SOUNDS like it came from a Trek movie--and evokes the high-adventure theme of the movie perfectly. Horner loved "bright" music and was especially strings-heavy in his themes of the 80's (Trek, WIllow, etc.) but I love this one in particular. Also brings me back to the one week Krull was in cinemas and I had the good luck to see it.
• Hans Zimmer - "The Battle" (Gladiator). Zimmer has been SUPER prolific over his career, with over 200 credits to his name. But for me, the battle sequence at the beginning of the movie, especially where the barbarians are lined up and the Roman army lets loose a flight of arrows, absolutely floored the f*ck out of me. Gladiator renewed Ridley Scott's career in a huge way and, I think, this sequence and it's epic music was a major contributor to the overall success of the film. What a fucking epic movie. (I don't toss that term around lightly.)
• Lalo Schifrin - "Theme from Mission: Impossible" (Mission: Impossible) Schifrin produced over 200 compositions in his career. He's an incredible composer, with scores of very recognizable themes to his name, but this one is probably the one that'll be first on every obit published, and for good reason. Eminently listen-able. BTW, the most liked comment on that YT video is hilarious.
• Henry Mancini - "Peter Gunn" (Peter Gunn) I was originally going to put The Pink Panther here, but once I remembered that he did Peter Gunn (aka the sound track to the arcade game "Spy Hunter"), I knew where I wanted to go. I swear, 007 should have this on auto-play the second he climbs into his Aston-Martin. Mancini was also massively prolific, with other major works like "Moon River" and the freaking ear-worm "Baby Elephant Walk," (don't blame me if you get that one stuck in your head!) but I love Peter Gunn above the rest.
• Maurice Jarre - "Laura's Theme" (Dr. Zhivago). If you don't recognize that name, click on it. You'll then think, "OMFG I KNOW that one!" instantly. As singular and recognizable as The Pink Panther or Mission Impossible's themes in its own way.
• Danny Elfman - "The Batman Theme" (Batman (1989)) From Oingo Boingo to one of the most in-demand composers for TV and film of the late '80's and 90's? Who'd have thought it? Elfman can be an acquired taste due to his tendency to build very rich, and some might say over-the-top, main themes. But this one in particular set the bar for every superhero soundtrack that came after. He followed it up with the equally good (and I'm sure some would say superior) Spider-Man. Oh, and he wrote the music to The Simpsons and Rugrats, so there's that too.

Okay there are so damn many composers I could go on with, but I'll let others fill them in if a score has particularly resonated with them.