Jon Wiederhorn

Their first No. 1 album.

The last album with Randy Rhoads.

So much for retirement. Ozzy Osbourne made his 'comeback' in 1995 with the 'Ozzmosis' album.

On Sept. 20, 1980, Ozzy Osbourne delivered his first solo album, 'Blizzard of Ozz.'

A monster album.

Mötley Crüe were unapologetically obsessed with crafting the kind of sticky, sleazy hard rock that defined MTV hair metal.

On Sept. 7, 1988, Metallica released '...And Justice For All,' their first album without Cliff Burton.

Skid Row's devastatingly heavy second album came out on June 11, 1991.

Their follow-up to 'The Black Album.'

This was the album in which two of Iron Maiden's key players, Bruce Dickinson and Adrian Smith, returned to the lineup.

A true game changer.

Here's how it happened.