Make Believe Ballroom (1949)

Liza Lee, fast-talking press agent for Al Jarvis, persuades Jarvis to stage a Musical Mystery Contest, with a $5000 prize to the person who can first name the most musical numbers and their performers. Drive-in carhops Gene Thomas ) and Josie Marlow run neck-and-neck in the contest, They are friendly rivals until college professor Leslie Todd begins courting Josie. Gene is thrown out of the contest on the grounds he tried to bribe sound engineer Jerskin Elliott into telling him the name and performer of the final, deciding mystery tune. Believing that Gene is innocent, Josie tricks a confession out of Elliott and clears Gene for the grand finale.