Ozzy Osbourne, the 76-year-old frontman of pioneering heavy metal band Black Sabbath, has died in the UK. His Black Sabbath bandmates and fellow musicians including Brian May, Elton John, and Rod Stewart paid tribute to the iconic singer. Osbourne, who was diagnosed with Parkinson's in 2019, recently performed at Black Sabbath's farewell concert in his hometown of Birmingham just weeks before his death.