Ian Gillan adding the then-seldom played "Maybe I'm a Leo" (named after Gillan's birth sign) and "When a Blind Man Cries" – the latter becoming a mainstay in the band's setlist ever since. He said that their first album with Morse, "Purpendicular", "was a such important record for Deep Purple that without that [other records] couldn't have been possible." He has remained Purple's lead singer, though the band has found more success touring than with producing records. Gillan pays particular interest to the lyrics in Deep Purple, and considers it his prime composing role within the band. Discussing the importance of lyrics,
David Coverdale part of a double bill with fellow Yorkshire rockers Def Leppard. In 2009, Whitesnake toured with Judas Priest on the "British Steel" 30th Anniversary Tour. On 11 August 2009, Whitesnake was playing a show at Red Rocks Amphitheatre in Morrison, Colorado, when Coverdale suffered some kind of vocal injury. After seeing a specialist, it was announced on 12 August 2009 that Coverdale had been suffering from severe vocal fold edema and a left vocal fold vascular lesion. The remainder of the tour with Judas Priest was cancelled so that this injury would not worsen. In early February 2010, David Coverdale