 Originally, director John Badham filmed the dance rehearsal sequence  with Tony and Annettes characters playing music in the background  at the same time with the action and dialogue; a form of production  conduct not considered etiquette or usually done. The song was  "Lowdown" by Boz Scaggs. However, after filming the scene, Badham  got word from Scaggs people they did not want the song in the  picture, and so the sequence was dubbed, with Travolta and Pescow  recording their lines in a vocal booth, and in the end composer  David Shire orchestrated an instrumental piece for the sequence;  ultimately the song (the title still unknown to this day) was picked  up by the National Football Leagues, and used to open and close the  Monday Night Football program for over twenty years.