In Chicago, an unemployed actor aims to solve the mystery concerning a string of ax murders, apparently committed by a lunatic.

In this musical comedy, a motley band of musicians have only their extreme poverty in common. They end up writing a hit and getting a recording contract. The trouble is, the composer's works are never played without another band member doctoring them up to make them swingier. Fortunately, the composer isn't too averse to the changes as he has just won the heart of the beauty who sings his revamped songs.