I was just thinking today about the score to "Ten Commandments."
This is a truly nauseating film by Cecil B. Demille featuring Charleton Heston in a perm and Yul Brynner as an ancient Egyptian (no further comment needed), and yet it has an absolutely beautiful score by Elmer Bernstein. The music is powerful, expressive, hugely varied in emotion, and expertly orchestrated. Also, the original - recorded in the 1950s - was done in stereo sound by a fantastic studio orchestra. it is disturbing to have such great music stuck to a bad movie. And yet it is shackled to an overblown, horrifically tacky potboiler of an "epic" that makes one want to puke.
What are some other great pieces of music stuck onto crappy films? One other I immediately think of is Bernard Herrmann's "Obsession." This is music of genius as great as "Vertigo" but is stuck with a total ripoff of Hitchcock by Brian "I'll Screw Anything For Money" De Palma.
All this indicates that every film composer must become a filmmaker and MAKE HIS OWN FILMS! Otherwise, no matter how brilliant a composer he is, he is in trouble...