Butler worked with EMG to create his own signature line of bass pickups, which help him maintain the classic bottom end sound he's enjoyed throughout Sabbath's legendary career.

Geezer and Black Sabbath return to live action with a series of North American shows starting March 31 in New York. On April 15, the band will release "The Complete Studio Albums (1970-1978)", an 8-disc box set featuring their 1970s catalog.