Timothy Leary was an American psychologist and writer, known for his advocacy of psychedelic drugs. On September 19, 1966, Leary founded the League for Spiritual Discovery, a religion declaring LSD as its holy sacrament, in part as an unsuccessful attempt to maintain legal status for the use of LSD and other psychedelics for the religion's adherents based on a "freedom of religion" argument. "The Psychedelic Experience" was the inspiration for John Lennon's song "Tomorrow Never Knows" in The Beatles' album "Revolver". He published a pamphlet in 1967 called "Start Your Own Religion" to encourage just that and was invited to attend the January 14, 1967 Human Be-In a gathering of 30,000 hippies in San Francisco's Golden Gate Park In speaking to the group, he coined the famous phrase "Turn on, tune in, drop out". The English magician Aleister Crowley became an influential icon to the new alternative spiritual movements of the decade as well as for rock musicians. The Beatles included him as one of the many figures on the cover sleeve of their 1967 album "Sgt. Pepper's Lonely Hearts Club Band" while Jimmy Page, the guitarist of The Yardbirds and co-founder of 1970s rock band Led Zeppelin was fascinated by Crowley, and owned some of his clothing, manuscripts and ritual objects, and during the 1970s bought Boleskine House, which also appears in the band's movie "The Song Remains the Same". On the back cover of the Doors compilation album "13", Jim Morrison and the other members of the Doors are shown posing with a bust of Aleister Crowley. Timothy Leary also openly acknowledged Crowley's inspiration.