Gustav Mahler's Symphony No. 5
Amen to that. Pure genius.
And, if you're so inclined, you can enjoy it in the comfort of your own home:
Rob's is a more standard configuration for Hauptwerk.
Then there's what's possible if you really have the dough. Another home setup:
Speaking of movie music,, how about,,,,, The Red Violin.
I've got so many favorites, it's hard to choose. I guess my tastes have moved backward in time to early music, but if we're talking classical music, I have to go with Mendelssohn's Scottish Symphony:
Oh, and thanks, John, for asking such an interesting question.