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",
Gillan (band) then accepted an offer to front Black Sabbath to the incredulity of the Gillan band members, particularly McCoy, and the acrimony remains to the present day. McCoy subsequently released compilations of studio out-takes to which he had the rights, known as "The Gillan Tapes", and ensured that revenues were distributed fairly amongst the band. Bernie Tormé and John McCoy collaborated on the GMT band project, releasing two albums in 2006 and 2009. According to at least one interview, Gillan did not have nodes removed as British doctors recommended, as he was afraid that would adversely affect his voice. A German