Basil Poledouris and Ron Grainer, probably the only composers I'd listen to outside of watching a show or film.
I find John Williams' most famous scores excessively irritating in large doses.
MAD Magazine in the late 70's had some bit like "2.5, the average in miles travelled to avoid hearing the STAR WARS
Alan Silvestri also did Predator's score, at least as mermorable as Back to the Future's
Randy Edelman deserves a nod for the overly reused music from Dragonheart
and Brisco County Jr.,
classic theme music.