"Firm Biz" is a single by "The Firm" which featuring rappers AZ, Nas & Foxy Brown.

The beat produced by hip hop beat maker Leshan David Lewis AKA "L.E.S".
R&B singer Dawn Robinson is featured on the song.

The above is the dirty/uncensored video version which is (for some strange reason) released with 4 missing "bars" by Foxy: