Philly soul is a subgenre of soul music that originated in Philadelphia during the late 1960s and 1970s. It is characterized by its smooth melodies, lush orchestration, and rich vocal harmonies. This style often incorporates elements of funk and jazz, creating a distinctive sound that emphasizes emotional expression and rhythmic grooves. Key figures in the development of Philly soul include Kenny Gamble and Leon Huff, who formed the production duo Gamble and Huff. They founded Philadelphia International Records, which became a major label for this genre. Notable artists associated with Philly soul include The O'Jays, Teddy Pendergrass, and Harold Melvin & the Blue Notes.