"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 (see below under "writings") 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".