On rare occasions, an unreleased classic rock song will become a cult classic; and still never get a proper album release.

These five albums defined the alt-rock explosion in the 1990s, and they've aged fairly well through the 2020s.

"I'm talking about the whole spectrum of progressive rock, from Pink Floyd to Frank Zappa, to Rush, to Mogwai, to Radiohead." ...

All great artists know how to kick the door down with a new record, but these songs didn't have the same fire as most would expect.