Disco Four was one of the prime party-jam producers in rap's old school, recording classics like "Move With the Groove" and "Do It, Do It" for Enjoy during the early '80s. Based in Harlem, the group formed around Ronnie D, DJ Al Bee, Greg G, Mr. Troy, Country, Kool Gee, and DJ Al Bee. A fraternal connection with Bobby Robinson -- one of the members was his son -- got them signed up to the Enjoy label (then the hottest place for hip-hop), but nepotism had nothing to do with their classic debut, 1980's "Move With the Groove." A smooth, quick-paced party track, it was followed by...