As the first group to score hits with the songwriting/production team of Kenny Gamble and Leon Huff, the Intruders played a major role in the rise of Philadelphia soul, but are sometimes lost in the shuffle amid better-known acts like the O'Jays or Harold Melvin & the Blue Notes. The Intruders were originally formed as a doo wop group in 1960, and sang around Philadelphia for several years. Lead singer Sam "Little Sonny" Brown, Eugene "Bird" Daughtry, Phil Terry, and Robert "Big Sonny" Edwards signed with Gamble and Huff's fledgling Gamble label in 1966.