Townshend came up with the concept of "Tommy" after being introduced to the work of Meher Baba, and attempted to translate Baba's teachings into music. Recording on the album began in September 1968, but took six months to complete as material needed to be arranged and re-recorded in the studio. "Tommy" was acclaimed upon its release by critics, who hailed it as the Who's breakthrough. Its critical standing diminished slightly in later years; nonetheless, several writers view it as an important and influential album in the history of rock music. The Who promoted the album's release with an extensive tour, including a live version of "Tommy", which lasted throughout 1969 and 1970. Key gigs from the tour included appearances at Woodstock, the 1969 Isle of Wight Festival, the University of Leeds, the Metropolitan Opera House, and the 1970 Isle of Wight Festival. The live performances of "Tommy" drew critical praise and revitalized the band's career.