Elton and Ozzy maintained a friendship spanning decades as legends in their respective musical domains. The Rocket Man hitmaker and the Black Sabbath frontman undoubtedly bonded as survivors of highly publicized, long-term struggles with substance abuse - while also ranking among the world's most celebrated performers.

Sir Elton John will be among the mourners at Ozzy Osbourne's funeral today following the Black Sabbath singer's death at the age of 76

Luminaries of the music world mourned the death Tuesday of Ozzy Osbourne at age 76, expressing affection and admiration for the heavy metal icon.