The Rolling Stones are an English rock band formed in London in 1962. The first stable line-up consisted of Brian Jones (guitar, harmonica), Mick Jagger (lead vocals), Keith Richards (guitar, backing vocals), Bill Wyman (bass), Charlie Watts (drums), and Ian Stewart (piano). Stewart was removed from the official line-up in 1963 but continued to work with the band as a contracted musician until his death in 1985. Brian Jones was the original leader of the group. The band's primary songwriters, Jagger and Richards, assumed leadership after Andrew Loog Oldham became the group's manager. Their musical focus shifted from covering blues songs to writing original material, a decision with which Jones did not agree. Jones left the band less than a month before his death in 1969, having already been replaced by Mick Taylor, who remained until 1974. After Taylor left the band, Ronnie Wood took his place in 1975 and continues on guitar in tandem with Richards. Following Wyman's departure in 1993, Darryl Jones was contracted by the band to play bass. Since the firing of Stewart (who continued to work with the band as a non-member), the Stones have not had a keyboardist as a member of the band, but have had long working relationships with Jack Nitzsche (1965–1971), Nicky Hopkins (1967–1982), Billy Preston (1971–1981), Ian McLagan (1978–1981), and Chuck Leavell (1982–present).