Smile (formed early autumn 1968)
Brian May - guitar/vocals
Tim Staffell - bass/lead vocals
Roger Taylor - drums/vocals
Chris Smith - keyboards
February 1969: - Chris Smith
Spring 1970: + Freddie Mercury - vocals/piano
Mike Grose - bass

(Note: a guy called Phil also played in Smile on keyboards sometimes)
Mike Dudley and Rick Thoring also played sometimes with Smile on stage