Rotary Connection's psychedelic chamber soul continues to sound ambitious and progressive decades after the group's departure. Instantly recognizable from the dramatic string arrangements of Charles Stepney and the five-octave voice of Minnie Riperton, the group released six albums between 1967 and 1971 that combined rock, soul, and psychedelia to theatrical and occasionally transcendental heights. The racially mixed group never really broke out of the Midwest, a region in which they frequently played out. Their failure to become more than a regional cult act can be partly att...