Today, as we mourn Ozzy's passing, we should remember that Black Sabbath's legacy extends far beyond their game-changing sound. They also established the principle that heavy music required equally ...

From Bruce Springsteen to Ozzy Osbourne, we're taking a look at the greatest singers in rock 'n' roll history.

The Black Sabbath frontman, who shocked audiences for decades and became an unlikely reality TV star, died Tuesday at 76.