Roberts also wrote lyrics for songs, which were used for the 1954 film On the Reeperbahn at Half Past Midnight featuring Hans Albers and Heinz Rühmann. In particular, he wrote both the lyrics and the music for the title waltz, originally for a 1912 revue of his at the Thalia, Bunt ist die Welt, and also prominently featured in the film Große Freiheit Nr. 7