Washington, D.C., vocalist Amii Stewart came whooping and shouting into the spotlight with an amazing though unconventional cover of Eddie Floyd's "Knock on Wood." Her boisterous vocal, coupled with a non-stop arrangement and equally unrestrained backing vocals, topped the pop charts in 1979 and reached number six on the R&B side. Stewart, who was in the Broadway musical Bubbling Brown Sugar, did another remake as a follow-up, the Doors' "Light My Fire," backed by "137 Disco Heaven." It dissipated the initial momentum of the lead single, and things went downhill from there. St...