Crowds throng into a theatre where a jazz orchestra are pumping out some lively toe-tappers. "Piggy" wants to take his girlfriend along to the concert so after an entertaining journey from her home on his dodgy looking contraption, they arrive and a bit of Al Jolson humour sets up a brief opportunity for an animated showcase of the sounds of Gus Arnheim's orchestra. That's all until she declares that they don't know what they're doing - and grabs a saxophone to engage in a bit of a duel with the trombonist before the pair steal the stage altogether then flee into a musically themed town. It's ...