Another milestone for the popularity of Indian music was the June 1967 release of the Beatles' "Sgt. Pepper's Lonely Hearts Club Band" album, the "spiritual centerpiece" of which, Lavezzoli writes, was George Harrison's Indian composition "Within You, Without You". Harrison joined Shankar in Madras in April 1968, following the Beatles' stay at Maharishi Mahesh Yogi's meditation ashram in Rishikesh, but a bout of dysentery prevented him from participating in filming for "Raga". Worth subsequently filmed Harrison's contributions at the Esalen Institute in Big Sur, California, on 10–11 June 1968. In one of the scenes, Harrison receives sitar tuition from Shankar; in another, they both participate in a singing class with students from Kinnara. While his immersion in Indian music had been the most significant factor behind Shankar's recent rise to international fame, Harrison would later cite this visit to Esalen as presaging the end of his commitment to the sitar. As of 2006, the scene in "Raga" featuring Shankar instructing Harrison was the only known film footage of Harrison playing the sitar during his years as a member of the Beatles.