from left to right:
Keith Howland on Guitar, Bill Champlain (background) on Keyboards and Singing Lead (on this song),
Jason Scheff on Bass Guitar, Robert Lamm (background) on Keyboards, Jimmy Pankow on Trombone,
Walt Parazaider on Saxaphone, Lee Loughnane on Trumpet. You can barely see Tris Imboden on Drums.