C & C Music Factory, sometimes called C + C Music Factory, was a pop and dance music group. The greatest hit by C & C Music Factory was 1991 number one song Gonna Make You Sweat (Everybody Dance Now). Although the group title said Featuring Freedom Williams, this song was actually performed by Martha Wash. Martha Wash was a long-time dance singer in groups like Two Tons O' Fun, The Weather Girls, and Black Box.