Ozzy Osbourne was fired from the band in 1979 because of his drug and alcohol addiction. American vocalist Ronnie James Dio was hired to replace him. The band recorded two studio albums and one live album with him. The first studio album of the two, 'Heaven And Hell' was considered a return to success and musical form, with 'Mob Rules', recorded with drummer Vinny Appice after Bill Ward left, also getting a good reaction. Dio and Vinny parted with Black Sabbath in 1982 over different musical ideas. Bill rejoined and the band hired Deep Purple singer Ian Gillan for the critically unsuccessful 'Born Again'. 