In the late 1960s, Osbourne and Butler first collaborated in the band Rare Breed, and they later joined Iommi and Ward, who had previously played together in Mythology, to form Polka Tulk Blues. They eventually renamed the band Earth, and changed it once more to Black Sabbath.

In the wake of Ozzy Osbourne's passing, Zak Starkey has shared his regret for once turning down an offer to sit behind the kit for Black Sabbath.

The co-founders of Black Sabbath paid tribute to their doomsayer-in-chief following the news of Ozzy Osbourne’s death at age 76 on Tuesday.