Mine in no particular order
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2001, A Space Odyssey
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Barry Lyndon
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Jaws (1)
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The Lord of The Rings (all)
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Immortal Beloved
Thanks
Q
Lord Of The Rings
Barry Lyndon
Princess Bride
Ladyhawke
Puppet Master series
Star Wars
Planet of the Apes (the original)
Star Trek: the Motion Picture
Psycho
And…um…uh…
-scratches head-
Up?
My criteria for best soundtrack is whether it enhances the movie and what it hopes to evoke, not detract from it. The five I picked do just that, even though Michael Giacchino’s music pisses me off a fair bit.
I’d put the Superman soundtrack at #1.
Alien
Vertigo
Days of Heaven
Le Mepris (Godard)
Platoon
Well, that’s all I can think of at the moment…
Star Wars
The Good, the Bad, and the Ugly
Conan the Barbarian
The Lord of the Rings
One from TV:
Battlestar Galactica (2004)
Wow! Some very sad and haunting music in Le Mepris, and sorry, but I’ve never seen Platoon or Days of Heaven. Looks like I’ll have some watching and listening to do.
Thanks
Q
I always loved how Godard used music, particularly recurring classical bits etc as an element in his movies.
Dambusters?
All five on my list are Peter Gabriel’s Passion, the soundtrack for The Last Temptation of Christ.
The next five are all Koyaanisquatsi.
I don’t have five off the top of my head, but the first one that comes to mind is Victory At Sea.
That synth soundtrack ruins what is otherwise one of my favourite films. 
My list:
Star Wars
Pirates of the Caribbean
Lord of the Rings
Back to the Future
Batman (1989)
Star Wars(I’ll lump all movies together so my entire list isn’t all SW)
2001
Raiders of the Lost Ark
Jaws
A Clockwork Orange
Blade Runner - Vangelis
1492 - Vangelis
Close Encounters of the Third Kind - John Williams
Tron Legacy - Daft Punk
Sneakers - James Horner
Sherlock Holmes - Hans Zimmer
North by Northwest - Bernard Herrmann
Star Wars
The Empire Strikes Back
Lord of the Rings: The Fellowship of the Ring
Pirates of the Caribbean: The Curse of the Black Pearl
Star Trek II: The Wrath of Khan
Off the top of my head, I’ll say:
Superman: The Movie
Star Wars
LOTR: The Fellowship of the Ring
Star Trek II: The Wrath of Khan
Star Trek VI: The Undiscovered Country
I agree with all the soundtracks so far mentioned and will add Gladiator.
Only f? Tough choice:
**2001
Fantasia** (despite the cuts and changes. But I love the orchestral version of Bach’s Tocatta and Fugue in D Minor)
The Seventh Voyage of Sinbad (I love Bernard Herman’s score – he did North by Northwest, cited above, and several other Hitchcock and Harryhausen films)
The Rocketeer – if only for the opening, although “The Airshow” is great, too.
Star Wars
Besides these:
Thunderball – possibly the best of Barry’s Bond scores
Patton – I listened to Jerry Goldsmith’s background music through many chess games with a friend)
The Magnificent Seven – even after they picked it up for a tobacco company, Elmer Bernstein’s score is impressive
Raiders of the Lost Ark – John Williams deserves several nominations for his lush orchestral scores, but I’ll limit it to two.
Barry Lyndon – i loved it, too, but it could’ve done with far fewer repetitions of that damned Sarabande.
Forbidden Planet – Louis and Bebe Barron’s electronic score was the first for a mainstream motion picture, and it works so well that t’s hard to imagine anything else in its place. I have a recording of it, along with one of their earlier works, which they borrowed from liberally for the score.
Alfred Newman’s The Best of Everything (1959). It’s my “life background music.”