Task: Question Answering
Input (English): Passage: By the mid-1960s Harrison had become an admirer of Indian culture and mysticism, introducing it to the other Beatles. During the filming of Help! in the Bahamas, they met the founder of Sivananda Yoga, Swami Vishnu-devananda, who gave each of them a signed copy of his book, The Complete Illustrated Book of Yoga. Between the end of the last Beatles tour in 1966 and the beginning of the Sgt Pepper recording sessions, he made a pilgrimage to India with his wife Pattie; there, he studied sitar with Ravi Shankar, met several gurus, and visited various holy places. In 1968 he travelled to Rishikesh in northern India with the other Beatles to study meditation with Maharishi Mahesh Yogi. Harrison's use of psychedelic drugs encouraged his path to meditation and Hinduism. He commented: "For me, it was like a flash. The first time I had acid, it just opened up something in my head that was inside of me, and I realized a lot of things. I didn't learn them because I already knew them, but that happened to be the key that opened the door to reveal them. From the moment I had that, I wanted to have it all the time – these thoughts about the yogis and the Himalayas, and Ravi's music."In line with the Hindu yoga tradition, Harrison became a vegetarian in the late 1960s. After being given various religious texts by Shankar in 1966, he remained a lifelong advocate of the teachings of Swami Vivekananda and Paramahansa Yogananda – yogis and authors, respectively, of Raja Yoga and Autobiography of a Yogi. In mid-1969, he produced the single "Hare Krishna Mantra", performed by members of the London Radha Krishna Temple. Having also helped the Temple devotees become established in Britain, Harrison then met their leader, A.C. Bhaktivedanta Swami Prabhupada, whom he described as "my friend ... my master" and "a perfect example of everything he preached". Harrison embraced the Hare Krishna tradition, particularly japa-yoga chanting with beads, and became a lifelong devotee.Regarding other faiths he once remarked: "All religions are branches of one big tree. It doesn't matter what you call Him just as long as you call." He commented on his beliefs:. 
Question: Who met the founder of Sivananda Yoga?
Output (English): Beatles.