Black Sabbath's farewell concert, which included hits like "Iron Man" and "War Pigs," comes as the rocker is living with Parkinson's disease.

Black Sabbath reunited for Ozzy Osbourne’s final show with the band at Villa Park in Birmingham on Saturday, and the electric concert featured performances by other rock legends. Steven Tyler, Metallica,

Bev Bevan explores the origins of heavy metal music and Black Sabbath's homecoming gig, with interviews and music from Black Sabbath, Judas Priest and Slipknot. As the music stops, fireworks go off above Villa Park as the founders of heavy metal bow out of their unbelievable career.