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,
John Lawton (musician) Roger Glover's "Butterfly Ball" live at the Royal Albert Hall in 1975, featuring David Coverdale, Glenn Hughes, Ian Gillan and Twiggy. He sang on Eddie Hardin's "Wizard's Convention II" with Chris Farlowe, Denny Laine, Paul Jones and Tony Ashton. Lawton worked with some of the finest record producers, including Tony Clarke (Moody Blues), Jimmy Miller (Rolling Stones), and Harold Faltermeyer (Pet Shop Boys), who produced the titles Lawton sang on the Lenny McDowell Project "Lost Paradise". Lawton sang with German rock band Rebel, later known as Zar, on three albums, during the late '80s -'90s including their hit singles "Line