Philadelphia International Records (PIR) was an American record label that is based in Philadelphia, Pennsylvania. It was founded in 1971 by the songwriting and production duo, Kenneth Gamble and Leon Huff, along with their long time collaborator Thom Bell. It was known 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 the R&B genre itself. During the 1970s, the label released a string of worldwide hits which emphasized lavish orchestral instrumentation, heavy bass, and driving percussion.