Early disco was dominated by record producers and labels such as Salsoul Records (Ken, Stanley, and Joseph Cayre), West End Records (Mel Cheren), Casablanca (Neil Bogart), and Prelude (Marvin Schlachter), to name a few. The genre was also shaped by Tom Moulton, who wanted to extend the enjoyment of dance songs — thus creating the extended mix or "remix", going from a three-minute 45 rpm single to the much longer 12" record. Other influential DJs and remixers who helped to establish what became known as the "disco sound" included David Mancuso, Nicky Siano, Shep Pettibone, Larry Levan, Walter Gibbons, and Chicago-based Frankie Knuckles. Frankie Knuckles was not only an important disco DJ; he also helped to develop house music in the 1980s.