Zombie’s got a point. You can probably end up humming any of the John Williams’ scores with little effort, whether it’s the Indy Jones series, the Star Wars flicks, or even Harry Potter (he scored the original, and was replaced in later movies, but each paid homage to the original scoring with Hedwig’s theme - the most recognizable piece in the series). He manages to capture the mood and a character’s story arc better than most anyone out there - including the likes of Hans Zimmer or Danny Elfman (though with Elfman, it’s easy to pick his scores out of a lineup as they’re unique, but not in the way Williams’ are).

Another whose scores are untouchable? Ennio Morricone.

Other movies don’t even make an effort to do orchestral scores, but rather piece together music soundtracks from disparate sources. It’s a good approach for what it is, but it’s not the same as scoring.