a number of the most popular soul music hits of the 1970s, including "If You Don't Know Me by Now" by Harold Melvin & the Blue Notes, "Back Stabbers", "For the Love of Money", and "Love Train" by The O'Jays, as well as the Grammy-winning "Me and Mrs. Jones" by Billy Paul. According to an interview on BBC Radio 4 on June 28, 2006, Gamble and Huff were inspired to write "Me and Mrs. Jones" after seeing someone they knew who appeared to be involved in an affair, meeting a woman in a cafe frequented by the songwriters. In collaboration with Bell, Gamble and Huff also formed the music publisher Mighty Three Music. Gamble and Huff's Philadelphia soul sound evolved from the simpler arrangements of the late-1960s into a style featuring lush strings, thumping basslines, and sliding hi-hat rhythms—elements that soon became the distinguishing characteristics of a new style of music called disco. By 1975, Philadelphia International and the Philadelphia soul genre it helped define had largely eclipsed Motown and the Motown Sound in popularity, and Gamble and Huff were the premiere producers of soul. Nearly all of the Philadelphia International records featured the work of the label's in-house band of studio musicians, MFSB (Mother Father Sister Brother). MFSB cut a number of successful instrumental albums and singles written and produced by the Gamble & Huff team and arranged by Bobby Martin including the 1974 number-one hit "TSOP (The Sound of Philadelphia)", now best known as the theme song from the American television show Soul Train. Political activism Throughout the 1970s, Gamble and Huff made music that addressed political and social issues faced by the African American community. Many of their songs articulated the theme of black pride and highlighted the Black Power Movement's struggle for power and self-determination. Representative examples include Billy Paul's "Am I Black Enough for You?" (1972), the O'Jays' "Give the People What They Want" (1975), and the star-studded "Let's Clean Up the Ghetto" (1977), the latter of which was the title track from an album that characterized Philadelphia International's broader political and social designs. Scholar James B. Stewart wrote of the album and initiative: "The record company's ability to mount this type of community empowerment venture, while functioning essentially as a component of CBS's black music department, is an interesting contrast to the more traditional style of corporate control of lyrical content ... The title