John Evans, born John Spencer Evans on March 28, 1948, in Blackpool, Lancashire, England, was educated at King’s College London and became a pivotal figure in Jethro Tull as their keyboardist from April 1970 to June 1980. In 1964, he joined school friends Ian Anderson, Jeffrey Hammond, and Barriemore Barlow in the jazz and blues band The Blades, which evolved into the John Evan Band (also known as John Evan’s Smash). They dropped the ‘s’ of his surname from the eponymous band name because it sounded “cooler”, and John retained his truncated stage name when he joined Tull. The group disbanded that year, and Evans pursued college studies until 1969, when he recognized his former bandmates’ song “Living in the Past” on the radio, noting its unusual time signature for a pop hit.

In 1970, Evans played as a session musician on Jethro Tull’s Benefit album, humorously credited as “John Evans, who played keyboards for our benefit,” before Ian Anderson convinced him to leave college and join the band full-time. His contributions, including the iconic piano introduction to “Locomotive Breath” composed while bandmates were at lunch, enriched Tull’s sound across albums like Aqualung (1971), Thick as a Brick (1972), A Passion Play (1973), WarChild (1974), Minstrel in the Gallery (1975), Too Old to Rock ‘n’ Roll: Too Young to Die! (1976), Songs from the Wood (1977), Heavy Horses (1978), and Stormwatch (1979). Known for his theatrical stage persona, Evans wore a trademark white suit with a yellow shirt and pink-and-yellow polka-dot tie, seen on WarChild and Bursting Out (1978), earning Anderson’s playful introduction as “everyone’s favourite ice cream salesman.” His pantomime gestures, reminiscent of Harpo Marx or Alice’s Mad Hatter, captivated audiences.

Evans left Jethro Tull in July 1980 alongside David Palmer, forming the short-lived band Tallis. He then ran a construction company, occasionally recognized by dedicated Tull fans, before emigrating to Melbourne, Australia. Hand injuries from long-distance bicycle touring and rallies ended his piano playing, but he remains active in music, singing in local choirs. Evans appeared in retrospective Tull releases, including the 2004 DVD A New Day Yesterday: The 25th Anniversary Collection (1994), the 2008 DVD Their Fully Authorised Story (1968–2008), and the 2009 DVD/CD Live at Madison Square Garden (1978), preserving his legacy as a key contributor to Jethro Tull’s progressive rock sound.