Philadelphia International Records (PIR) is an American record label based in Philadelphia. It was founded in 1971 by the writer-producer duo, Kenneth Gamble and Leon Huff, along with their long time collaborator Thom Bell. It was famous for showcasing the Philadelphia soul music genre (also known as Philly soul) that was founded on the gospel, doo-wop, and soul music of the time. This Philly Soul sound later became a prominent and distinct era within R&B itself. During the 1970s the label released a string of worldwide hits which emphasized lavish orchestral instrumentation, heavy bass, and driving percussion. Some of their most popular and best selling acts included Patti LaBelle, The O'Jays, Harold Melvin & the Blue Notes, Teddy Pendergrass, MFSB, Billy Paul, and Lou Rawls. Between 1971