Several young music enthusiasts find a helpful supporter of their passion—singing and making music—in the endearing, friendly elderly gentleman Mr. Herzlieb, who works as a night watchman at a pawnshop specializing in musical instruments. Using a shortwave transmitter, they are even able to broadcast their pop songs all the way to Brazil, after which the music lovers are offered a gig. A German "Schlager-Film" (a musical comedy with popular songs).