The Rolling Stones are an English rock band formed in London in 1962. Diverging from the popular pop rock of the early-1960s, the Rolling Stones pioneered the gritty, heavier-driven sound that came to define hard rock. Their first stable line-up was bandleader Brian Jones, Mick Jagger, Keith Richards, Bill Wyman, and Charlie Watts. The band’s primary songwriters, Jagger and Richards, assumed leadership after Andrew Loog Oldham became the group’s manager in 1963. Jones left the band shortly before his death in 1969, having been replaced by Mick Taylor, who in turn left in 1974 to be replaced by Ronnie Wood. Since Wyman’s departure in 1993, Darryl Jones has served as bassist.