im still new to the series and very on/off with a few, but man does final fantasy have some phenomenal OSTs.
i keep coming back to the PR version of FF1's Chaos Shrine, such a forlorn and haunting track. it's been stuck in my head ever since playing it.
i especially love that rising, triumphant string melody that fakes you out with a minor key right on the final note, ughhhh. immensely talented musical storytelling.
