Ozzy Osbourne obituary: heavy metal wildman and lovable reality TV dad

As the frontman of Black Sabbath, Ozzy Osbourne, who has died aged 76, did not only help invent heavy metal, said The Daily Telegraph, he also pioneered its outrageous lifestyle: "preposterous theatrics", rumours of satanism and shocking excesses. "I'm something of a madman," Osbourne said. "If…