I think people chronically misunderstand this category.
The music in Drive that people were really voting for is not original music.
Not necessarily true. Yes, I'm sure a lot of people had "A Real Hero" and "Nightcall" in mind when they were voting, but Cliff Martinez's score is such a vital part of how great this movie is.
This raises a question, though. We're not the Academy, why do we even give a fuck about original music or sourced music? Maybe for the future, the category should just be "Best Music", as in the best use
of music, be it score or soundtrack or whatever.