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Dio is a hard rock band led by vocalist Ronnie James Dio, who formed it in October 1982 after leaving Black Sabbath. In addition to Ronnie, Vivian Campbell played guitar; Jimmy Bain, bass; and Vinny Appice, drums.
In May 1983 they released their debut album Holy Diver, on which Ronnie James Dio played keyboards. To avoid having the vocalist stuck behind a keyboard in concert, the band recruited keyboardist Claude Schnell.
Now a five member band, they released The Last in Line on July 2, 1984, followed by Sacred Heart on August 15, 1985. Several songs were recorded during the tour for that album; they were to be released along with the studio-recorded "Time To Burn" on the "Intermission" EP.
In 1986 Vivian Campbell left the band and was replaced by Craig Goldie. On July 21, 1987 their fourth album Dream Evil was released.