The gloomy, demon-invoking lead singer of the pioneering band Black Sabbath who became the throaty, growling voice of heavy metal, Ozzy Osbourne has died.

Geezer Butler penned an emotional tribute to Ozzy Osbourne. Days after the Black Sabbath frontman died at age 76, Butler reflected on his 57-year friendship with the singer, which started when Osbourne showed up at his doorstep barefoot,

Ozzy Osbourne was known for his wild stage persona and outrageous rock star antics, but behind the scenes, he had a heart of gold, according to his longtime Black Sabbath bandmate, Geezer Butler. In an essay for The Sunday Times,