One of the most commercially successful funk groups of the '70s, the multi-racial Rufus are today best remembered for launching the career of soul diva Chaka Khan, whose fiery lead vocals were easily the band's focal point. Powered by Khan -- who was eventually billed in addition to the group -- and an unerring sense of groove, Rufus scored an impressive string of hit singles on both the pop and R&B charts, which lasted through the '70s and up to Khan's official departure in 1983. Rufus grew out of the Chicago band the American Breed, which had a hit in 1968 with the oldies-r...