This movie is like a Kay Kyser movie without Kyser (he's replaced by Ray Ventura) and with Audrey Hepburn; she doesn't show up until a half hour in and is tres Francaise in this slickly made semi-diagetic musical -- that means that the music is played in the "real" world of the movie, instead of arising to allow people to sing or dance because they feel a need to.
Everyone goes to Monte in search of a misplaced baby, who has been adopted by Ventura's band. The big production number seems to be modeled on the finale from King of Jazz -- yes, there are bagpipes. It was co-written and co-directed by Jean Boyer, who specialized in fluff like this. It's fun and forgettable except for Miss Hepburn's early appearance.