Ian Gillan band, who had not had any holiday since their initial rehearsals at Hanwell. He started drinking, and relationships between him and the rest of the band became strained, particularly with Blackmore. On 6 November 1971, he collapsed with hepatitis while waiting to board a plane in Chicago, cancelling the remainder of a US tour. By December 1972, having recorded "Machine Head", "Made in Japan" and the yet to be released "Who Do We Think We Are" with Deep Purple, Gillan finally decided the workload had driven him to exhaustion. Unlike some band members, he was unhappy about "Made in Japan",
David Coverdale part, the problem had been the comparison to Robert Plant who had fronted Led Zeppelin, as vocalist, with Jimmy Page. Some of their audience criticised Coverdale, feeling he was merely a Plant clone; Plant himself referred to the team-up as ‘David Cover-version’. Others felt the short-lived collaboration only served to inspire Page to once again hook up with Plant, a year later. In 1994 Coverdale assembled a new line-up of Whitesnake (with the exception of Coverdale's musical partner, guitarist Adrian Vandenberg and bassist Rudy Sarzo, both of whom had been in Whitesnake since 1987) to tour for the release of