The Rolling Stones are an English rock band, formed in London in April 1962 by Brian Jones (guitar, harmonica), Ian Stewart (piano), Mick Jagger (lead vocals, harmonica), and Keith Richards (guitar, vocals). Bassist Bill Wyman and drummer Charlie Watts completed the early line-up. Jones led the band until Jagger and Richards assumed leadership after teaming as songwriters. In 1969 Jones' diminishing contributions to the band and his inability to tour, due to medical and legal complications, caused him to leave the band three weeks before drowning in his swimming pool. Jones' replacement Mick Taylor stayed with the band until leaving voluntarily in 1974, with Ronnie Wood taking his place since then. Wyman retired from the band in 1993; his replacement Darryl Jones has not been made a full member. Stewart was taken from the official line-up in 1963 and continued as the band's road manager and occasional pianist until his death in 1985. Since 1982, Chuck Leavell has been the band's primary keyboardist.