Just let the music set you free
When the idea came about during the filming of Desperately Seeking Susan for Madonna to include hew new dance track ‘Into The Groove‘ as background music during the movie, the producers thought it was a great idea. However, due to the really tight turnaround time for what remained of the shooting schedule, Madonna and Stephen Bray didn’t have time to complete the finished master of their song in time. Thus, they were only able to deliver their unfinished studio demo of the song to the producers. So impressed were they with the demo they went right ahead and used it in its unfinished state and that is what you hear in the movie!
The completed master of the song was delivered to Sire later in time to be released as a single outside North America, whereupon its huge success prompted its inclusion on the re-packaged Like A Virgin album to boost sales yet further!