Effective period / Period of releases: 1970 - 2012

Members: Lee Thornburg, Roger Hodgson, Kevin Currie, John Helliwell, Rick Davies, Jesse Siebenberg, Bob Siebenberg, Dougie Thomson, Richard Palmer-James, Mark Hart, Carl Verheyen, Dave Winthrop, Robert Millar, Keith Baker, Cliff Hugo, Frank Farrell (2), Steve Reid (5)

British/American rock band formed in London, England in 1969 - Disbanded in 1988 - Reunited intermittently from 1996 to 2002 - Reformed in 2010/11 for European tour.

Lineup on LP 1 in 1970:
● Roger Hodgson – vocals, acoustic guitar, cello, flageolet, bass (1970–1983)
● Rick Davies – vocals, piano, electric piano, organ, harmonica (1970–1988, 1996–2002, 2010–2011, 2015)
● Richard Palmer-James – acoustic & electric guitar, balalaika, vocals (1970–1971)
● Robert Millar – drums, harmonica, percussion (1970–1971)

Lineup on LP 2 Indelibly Stamped in 1971:
● Roger Hodgson – vocals, acoustic & electric guitar, bass (1970–1983)
● Rick Davies – vocals, keyboards, harmonica (1970–1988, 1996–2002, 2010–2011, 2015)
● Dave Winthrop – flutes, saxophones, vocals (1970–1973)
● Frank Farrell (2) – bass, piano, accordion, background vocals (1971–1972)
● Kevin Currie – drums, percussion (1971–1973)

Classic lineup 1973–1983–1988:
● Roger Hodgson – lead vocals, keyboards, guitars (1970–1983)
● Rick Davies – vocals, keyboards (1970–1988, 1996–2002, 2010–2011, 2015)
● John Helliwell – woodwinds, keyboards, backing vocals (1973–1988, 1996–2002, 2010–2011, 2015)
● Dougie Thomson – bass (1972–1988)
● Bob Siebenberg – drums (1973–1988, 1996–2002, 2010–2011, 2015)

Current lineup:
● Rick Davies – lead vocals, keyboards, harmonica (1970–1988, 1996–2002, 2010–2011, 2015)
● Mark Hart – vocals, keyboards, guitar (1996–2002, 2015; touring musician: 1985–1988)
● John Helliwell – woodwinds, keyboards, backing vocals (1973–1988, 1996–2002, 2010–2011, 2015)
● Carl Verheyen – guitars, percussion, backing vocals (1996–2002, 2010–2011, 2015; touring musician: 1985–1986)
● Gabe Dixon – keyboards, tambourine, vocals (2010–2011, 2015)
● Lee Thornburg – trumpet, trombone, keyboards, backing vocals (1996–2002, 2010–2011, 2015)
● Jesse Siebenberg – vocals, guitars, percussion (1997–2002, 2010–2011, 2015), keyboards (2010–present)
● Cliff Hugo – bass (1996–2002, 2010–2011, 2015)
● Bob Siebenberg – drums, percussion (1973–1988, 1996–2002, 2010–2011, 2015)
● Cassie Miller – backing vocals (2010–2011, 2015)

Rick Davies, John Helliwell and Bob Siebenberg are the only members of the "classic" lineup remaining in the band to this day.
Roger Hodgson left the band in 1983.