I'm going to assume that most people here have a period in which they train for hours to make their characters stronger. Whether it's stealing magic, making materia stronger, or filling out the sphere grid. I'm also going to assume that after a few hours of listening to the same damn World Map song or area song, you feel like stabbing your ear drums out.
If you're one of those people, do you like to listen to other music while training? If so, what do you listen to while you rapidly kill monsters and gain levels?
I've found that listening to Metallica (mostly the Black Album) in VII seems to get my blood going. For VIII and X, Muse seems to work beautifully. I haven't tried anything for IV-VI or IX, yet.