Martha Wash sang on this, providing the powerful line, "Everybody Dance Now!" She was a member of The Weather Girls ("It's Raining Men
") and provided vocals for the group Black Box. She was overweight and not very photogenic, so she was replaced in the video by a slender singer/model named Zelma Davis, who lip-synched her lines. Wash's name didn't make the initial album credits either. After some legal wrangling, she was given proper credit for her contribution. In the credits in the video for the song, this line was included: "Additional vocals by Martha Wash, visualized by Zelma Davis."
This wasn't the first time Martha was whitewashed - she sang on three #1 Dance hits for the act Black Box, and was replaced in those videos by a model. Wash sued both the Black Box and C+C producers, reaching a settlement that included a record deal as a solo artist.