Following his 1970 departure from THE GUESS WHO, singer-guitarist Randy BACHMAN recorded a solo album ("Axe") and planned a project with ex-THE NICE keyboardist Keith EMERSON (Later cancelled due to illness) before forming BACHMAN-TURNER OVERDRIVE in 1972. Originally called BRAVE BELT, the heavy-metal group was comprised of fellow THE GUESS WHO alum Chad ALLAN, bassist C.F. TURNER with Randy's brother and drummer Robbie BACHMAN. After "I" & "II", Chad ALLAN was replaced by another BACHMAN brother, guitarist Tim. In homage to the trucker's magazine of the same name, the unit became BACHMAN-TURNER OVERDRIVE. While their self-titled 1973 debut caused little impact, "II" was a smash, netting a hit single with the anthemic "Takin' Care Of Business". Prior to the release of 1974's "Not Fragile", Tim BACHMAN exited the group to begin a career in production, and was replaced by Blair THORNTON. The album was a chart-topping success, and notched a number one single with "You Ain't Seen Nothin' Yet". After 1977's "Freeways", Randy BACHMAN left the group for a solo career and formed another group, called IRONHORSE. BACHMAN-TURNER OVERDRIVE continued on in his absence with replacement Jim CLENCH for two more albums, "Street Action" and "Rock N' Roll Nights" (Both 1978). At the tail end of the decade, the band dissolved, but in the Eighties they regrouped to tour as both BACHMAN-TURNER OVERDRIVE (Led by Randy) and B.T.O. (Led by Robbie). The ensuing confusion the name game triggered ultimately resulted in Randy BACHMAN filing suit against his onetime bandmates for rights to the group's logo.