Among the experimental songs that Revolver featured was "Tomorrow Never Knows", the lyrics for which Lennon drew from Timothy Leary's The Psychedelic Experience: A Manual Based on the Tibetan Book of the Dead.
Di antara nomor lagu paling eksperimental dari album Revolver adalah Tomorrow Never Knows yang liriknya ditulis Lennon berdasarkan buku Timothy Leary, The Psychedelic Experience: A Manual Based on the Tibetan Book of the Dead.