[ascagnel_]

The custom music wasn’t followed the game levels — the game was designed for you to swap in your own CD, and the levels would be generated off of that music.

It’s why the digital re-releases have been somewhat lackluster — the default music is fine, but not notable on its own.

[goosedragons]

The PS3 PSN version still works with CDs at least. Kinda better because you don't need to swap discs. PS4/PS5 (and obviously Vita) can't read CDs.