A vocalist valued among listeners of deep soul and traditional gospel alike, Winfield Parker came up as a young saxophonist in Maryland/D.C.-area groups such as the Veejays and Sammy Fitzhugh & the Moroccans. Prior to launching a solo career, he also played behind Little Richard and led a band called the Imperial Thrillers. From the late '60s through the '70s, Parker recorded sides for an assortment of labels that included Arctic, Ru-Jac, Wand, Spring, and GSF. His commercial peak was achieved in 1971 through his version of "S.O.S. (Stop Her on Sight)," a song popularized five...