Jon Wiederhorn

Black Sabbath, with Ronnie James Dio back in the band, released their 'Dehumanizer' album on June 22, 1992.

Take a look back at Municipal Waste's groundbreaking album 'The Art of Partying.'

On May 15, 1987, Motley Crue released their 'Girls, Girls, Girls' album.

It'd be the last with Bruce Dickinson for a while.

On May 10, 1983, a metal revolution was underway.

On April 27, 1979, after various attempts to get Ozzy back on the team, Black Sabbath fired their lead singer.

On April 13, 1999, Lamb of God, then known as Burn the Priest, released their debut disc.

Take a look back at the landmark disc here.

It wasn't an April Fool's joke.

Here's how it happened.