Best known for recording the hit theme to Soul Train, MFSB were the pre-eminent instrumental outfit of Philadelphia soul, backing numerous Kenny Gamble/Leon Huff productions while recording regularly on their own throughout the '70s. The group's name stood for Mother Father Sister Brother, and prior to their formation in 1971 as the house band at Gamble and Huff's Sigma Sound studios, some of the core personnel had been working together as early as 1968. Guitarists Norman Harris and Bobby Eli, bassist Ronnie Baker, and drummer Earl Young had an uncredited dance hit with "The Horse," the instrumental flip side of singer Cliff Nobles' "Love Is All Right." As the Horse dance craze swept Philadelphia, the group also backed singers the Fantastic Johnny C and (as the James Boys) Jesse James, while also issuing singles as the Music Makers and Family.