MOB RULESBlack Sabbath: Ronnie James Dio (vocals); Tony Iommi (guitar); Geezer Butler (bass); Vinnie Appice (drums). Additional personnel: Geoff Nicholls (keyboards). Recorded at The Record Plant, Los Angeles, California. Black Sabbath had put itself back on track both musically and commercially with the 1980 album HEAVEN AND HELL, as the addition of new vocalist Ronnie James Dio was the shot in the arm Sabbath needed. A follow up was released one year later,