There's two versions that I know of that were in since 1.0: Uematsu's score (the "rental") and Soken's (Grand Company one).

Not that there's anything wrong with the GC choco music, but after a few listens the grand-ness and fanfare of it becomes annoying and grating to listen to. The "rental" is more relaxing and background-ish. If I could swap the two, I'd be set. But for now, I just disabled mount music.