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.

Following the passing of metal icon Ozzy Osbourne, aged 76, Elton John has paid tribute to his good friend and fellow musician.