MFSB (short for "Mother Father Sister Brother") was a pool of more than thirty resident studio musicians based at Philadelphia’s famed Sigma Sound Studios . They worked closely with record producers Kenny Gamble and Leon Huff and Arranger Thom Bell, and backed up such groups as The Bluenotes, O’Jays, Stylistics, Spinners, Intruders, Three Degrees, Jerry Butler, Wilson Picket, and Billy Paul . Starting in 1974, MFSB started recording for the Philadelphia International label. " TSOP" was their first product, produced in March, and it peaked at Number One. TSOP was most influential in establishing the Disco sound . They later released other successful singles and albums as a stand-alone recording act.

MFSB (short for “Mother, Father, Sister, Brother”, although schoolyard rumours would have had this stand for “Mother F****** Son of a Bitch”) were a loose conglomeration of studio musicians who provided backing tracks for dozens of seminal Philadelphia soul recordings in the 1970s, and later released successful songs and albums as a standalone recording act. Assembled by the production team of Gamble & Huff, MFSB was the house band for their Philadelphia International Records label and p