I'm very used to FFIV having the crystals on the loading screen, though I'm not entirely sure if those are elementals. FFI's crystals are elemental. I can't remember about Mystic Quest - I think so... I'm a bad kid for not having played V or VI. And though the crystal is back in FFIX, it makes no sense and is safer to ignore it.

But yeah, where there's a Final Fantasy, there's the 'Final Fantasy' theme and the crystal 'Prelude'.