The dude supposedly bit the head off a bat during a concert. His drug and alcohol intake over the years is legendary. And he helped define the parameters of sludge metal.

For those reasons alone, never mind all that great music he's made in his career, Ozzy Osbourne has earned his place in rock history.

But there's more to it than that. Osbourne has become an institution, forming his own summer music festival and starring in his own hit reality TV show. And he still makes pretty good records.

In 2012, 'Kerrang!' readers crowned the Black Sabbath frontman as the "greatest rock star in the world today." In 2012. Your move, Kings of Leon.