It's unusual to describe musicians as “itinerant,” but "Jigger" (Richard Whorf) and his new group are practicing inside a railroad car while traveling across the nation between performances. During their journey, they come across “Del” (Lloyd Nolan), who, after an awkward beginning involving alcohol, food, and a firearm, becomes one of them. He informs them about a bar where they can secure a regular engagement, which is fortunate timing because the singer "Character" (Priscilla Lane) is expecting a child. Her trumpet-playing husband “Powell” (Jack Carson), however, develops feelings for “Kay” (Betty Field)—unaware that she and “Del” share a past that neither of them can definitively say is resolved. Fortunately, this situation quickly dissipates when "Jigger" attempts to have her become the band's leader, kidnaps her, then returns to the group looking shaken. Following this, Kay and "Del" argue, which results in a rather unfortunate outcome, but that isn’t necessarily the end of their story or the railway line. There are several enjoyable musical numbers, with the song sharing its name being particularly memorable among the bluesy, barn-dance style performances. Lloyd Nolan doesn't display his usual intensity and the romantic entanglements occasionally feel like a comedic exchange of spouses, though there are moments of suspense throughout. The film moves along steadily thanks to solid work from everyone involved, highlighted by Matt McHugh’s intoxicated performance and two women who could rival stray cats. It wasn’t what I anticipated based on the title, but I did appreciate this combination of different styles.

Source on TMDB