I've always liked soundtracks. For years, I kept a little journal of the music composers of movies, and my impressions. (Mostly so I could write off the movie ticket for tax purposes.)
I have no evidence for it, but soundtrack composition seemed to decline in favor of pop songs. There were so many movies that had no actual original composition, that I eventually stopped the practice.
And then, they began re-using the same soundtrack for a couple movies, and that would get annoying.
But Brett got me thinking, and so I iTuned and CD-burned The Other Boleyn Girl. It's dark, a little tortured, and has plenty of screaming violins--just the mood for my WIP. The music is so "background," that it doesn't distract me from writing and set my analytical music mind into high gear.
Have you ever written to soundtrack? Do you ever buy soundtracks of original composition (not compilations of tunes they stuck to a movie)?
Do you have a favorite soundtrack? A movie you remember, where the music just made the mood of the movie?