FanFiltration said:
...1/3 are soundtracks or music based on a film or score.

That's easily my ratio as well. I've been a soundtrack uber-nerd since I was a kid. My very first ever album purchase was the soundtrack to Live And Let Die - and with God as my witness - I'm listening to it at this very moment.

Entirely too many to list, but personal favorites that come to mind quickly;

Alien

Jaws

Patton

Batman Begins

Live And Let Die

Dances With Wolves

The Conversation

Indiana Jones - all

2001 A Space Odyssey

Memoirs Of A Geisha

Vertigo

Apollo 13

Cool Hand Luke

Moon

Casino Royale

Star Wars77

If I had to guess, I'd say that 75% of the time I'm listening to music, it's film scores. A fair portion of the rest of the time, I'm listening to full audio rips of films.