 In an early version of the script, Harry discovers Dana ditching  school to sing in her boyfriends band. While Harry drives Dana back  to school, they sing the song she was doing ("Sunshine of Your Love"  by Cream) when he walked in on her. Both scenes were cut from the  movie. Instead, you can faintly hear the song playing on Danas  Walkman in the scene before her boyfriend picks her up for school.