They are Seven Like the Seven Plagues

A painter and a composer, twins and both of them carefree, live their life in dire straits, which does not make them unhappy. The are waiting for success to solve their financial problems, but success is in no hurry to reach out for them. There is a fun-fair in the neighbourhood, where a group of kids get into a band of their own. The composer turns them into a travelling band. They are soon joined by a swing boy and his fiancée. The daughter of a hotel-owner falls in love with the composer, while her mother falls in love with the painter. They start supporting the band which, from now on, performs regularly in the garden of the hotel and is a huge success. (official distributor synopsis)