We take a look at four incredible rock albums that became immensely popular despite never being officially released.

Nirvana's Nevermind and "Smells Like Teen Spirit" both find their way back to one Billboard chart apiece, while also appearing on at least one other ranking as well.

Taylor Swift ties Elvis Presley's record for the most No. 1 albums in U.K. history among foreign artists, as Lover (Live In ...