MFSB (Mother Father Sister Brother)‎

MFSB was a pool of more than thirty studio musicians based at Philadelphia’s famed Sigma Sound ‎Studios. They worked closely with the production team of Gamble and Huff and producer/arranger ‎Thom Bell, and backed up such groups as Harold Melvin & the Blue Notes, the O’Jays, the ‎Stylistics, the Spinners, Wilson Pickett, and Billy Paul.‎

http://en.wikipedia.org/wiki/MFSB