The original lineup consisted of Randy Bachman (lead guitar, lead vocals), Fred Turner (bass guitar, lead vocals), Tim Bachman (guitar, vocals) and Robbie Bachman (drums). This lineup released two albums in 1973. The second and most commercially successful lineup featured Blair Thornton (lead guitar), in place of Tim Bachman. This lineup released four albums between 1974 and 1977, including two that reached the top 5 in the U.S. pop charts, as well as the band's only U.S. No. 1 single ("You Ain't Seen Nothing Yet"). Subsequent lineups enjoyed only moderate success.
