Harold Melvin and the Blue Notes were a significant American R&B/Soul group active primarily in the 1970s. Characterized by their smooth, emotive sound, they are best remembered for their collaborations with Philadelphia International Records and famed producer duo Gamble and Huff. Notable for featuring lead vocalist Teddy Pendergrass, their influential works include hits such as "If You Don't Know Me by Now" and "Wake Up Everybody." The group's music, marked by its socially conscious lyrics and lush orchestration, played a fundamental role in shaping the sound of Philadelphia soul.