Producers, writers and musicians Kenny Gamble and Leon Huff founded the legendary record label Philadelphia International and helped pioneer the sound of Philadelphia soul.

Together, Gamble and Huff wrote and produced over 170 gold or platinum records, including "Love Train", "Me and Mrs. Jones" and "If You Don't Know Me By Now". Their 4 CD box set is called Love Train: The Sound of Philadelphia.

In March of 2008, the duo was inducted into the Rock and Roll Hall of Fame.