Jefferson Airplane, a rock band based in San Francisco, California, was one of the pioneering bands of psychedelic rock. Formed in 1965, the group defined the San Francisco Sound and was the first from the Bay Area to achieve international commercial success. They were headliners at the three most famous American rock festivals of the 1960s—Monterey (1967), Woodstock (1969) and Altamont (1969)—and the first Isle of Wight Festival (1968) in England.