TSOP by MFSB

"TSOP (The Sound of Philadelphia)" is a 1974 hit recording by MFSB (Mother, Father, Sister, Brother) featuring vocals by The Three Degrees. The track sold over one million copies, and peaked at number one on the US Billboard pop and R&B charts.

Assembled in 1972 by record producers Kenneth Gamble and Leon Huff, MFSB was the house band for Philadelphia International Records. Over 30 musicians at Sigma Sound Studios originated the signature smooth "Philly sound" that dominated the early 1970s.

Don Cornelius, the creator and host of Soul Train, refused to allow any references to the name of the TV series when the single was released, requiring Gamble and Huff to adopt the alternate title for the release. Cornelius would later admit that not allowing the single to be named "Soul Train" was a major mistake on his part.