Break-up of the Beatles Lennon was in a fragile state of mind after returning from the band's sojourn in India in early 1968 and was disillusioned and resentful that their Transcendental Meditation guru, Maharishi Mahesh Yogi, had not fulfilled Lennon's expectations. Lennon became discontented over his personal identity and his artistic role within the Beatles and entered another period of drug use, which coincided with a deterioration in his marriage and family life. He began to develop an intense interest in the work of Yoko Ono, a Japanese-American conceptual artist whom he had first met at one of her exhibitions in 1966. The pair
The Beatles in Hamburg later Kirchherr met the Beatles at the Hamburg airport and told them Sutcliffe had died of a brain haemorrhage. In 1966, Voormann was asked by Lennon to design the sleeve for the Beatles' album "Revolver", and also played bass on solo recordings by Lennon, McCartney, Harrison, and Starr. In 1995, Voormann designed the artwork for the three-volume CD sets in The Beatles Anthology series. In 1999, Kirchherr published a book called "Hamburg Days" (a two-volume limited edition) containing a set of photographs by Kirchherr and "memory drawings" by Voormann of the Beatles time in Hamburg. The Beatles returned to Hamburg