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.
Một trong những ca khúc thể nghiệm trong Revolver là "Tomorrow Never Knows" mà phần lời được Lennon lấy từ cuốn sách The Psychedelic Experience: A Manual Based on the Tibetan Book of the Dead của Timothy Leary.