When: whenever I need to feel like I'm fighting that awesome boss battle again, or exploring that one place in that one game, or just when I need to listen to something awesome. It helps me when I'm tired working through assignments, or when I need to relax.

Where: where ever I can; that is, when I don't have to keep an ear out for other stuff.

Why: I think I sort of explained why when I answered the 'when' question; but it's just great music, really.

I like probably all the FF OST's out there, it's all great music. I really enjoy the Shadow of the Colossus OST as well, and Assassin's Creed.