Movies with John Williams composing can always earn a top spot for me - whether it’s dramatic like Schindler’s List, playful/action like Indiana Jones and Harry Potter or more grandiose like Star Wars (heck yeah to Duel of Fates!) or Jurassic Park (already mentioned). To me, he is THE epitome of movie composers.
A close 2nd would be the work of Hans Zimmer (Gladiator as mentioned, Pirates of the Caribbean, Inception and Planet Earth) and Howard Shore (LOTR mentioned and The Hobbit)
Some other fav movie scores/soundtracks of mine include:
Swing Kids
Last of the Mohicans
Mambo Kings
Pulp Fiction
The Great Gatsby
Nightmare Before Christmas and Elf (for holiday feels)