Film music ... Something that can add a lot of atmosphere to a film.
Personally I love John Williams, Star Wars, Supernan, Jaws, Close Encounters of the third kind ... Did he ever make a poor soundtrack?
Love the theme from the original Battlestar Galactica, Terminator, Conan, Wild at Heart, Peggy Sue Got Married, Fistful of Dollars (whole trilogy)
So many great scores, which do you like?