June 1, 1967, the “Summer of Love,” The Beatles released Sgt. Peppers Lonely Hearts Club Band. The album was a revolution in music, art and spirit. Four yoga spiritual masters–Paramhansa Yogananda, Swami Sri Yukteswar, Lahiri Mahasaya, and Mahavatar Babaji–appeared in the cover art. Beatle George Harrison led the way, giving away Yogananda’s Autobiography of a Yogi everywhere he traveled. Harrison also brought all the Beatles to India on spiritual pilgrimage to learn meditation from the yoga masters.