Wikipedia:
Hans Otten (* July 10, 1905 in Cologne; † October 31, 1942 ibid) was a German composer.
The main creative period of Hans Otten falls in the second half of the 1920s and in the 1930s. A gifted musician, Otten wrote vocal pieces for male choirs, hit songs, and especially carnival songs, most of which were set to lyrics by the carnival speaker and dialect poet Gerhard Ebeler. Ebeler was also usually the first to perform the songs and then sing them on record. He also ran his own music publishing company. In the years before the Second World War, the Otten-Ebeler team supplied the Rhenish carnival with relevant songs. Many of their hits have become Cologne evergreens that are still sung with pleasure today. Her collective ''Schunkelwalzer'' (waltz whose rythmn makes it easy to sway) "Du kannst nicht treu sein" ("You can't be faithful"), which the Cologne folk singer Grete Fluss had launched on December 31, 1932, in the carnival revue "D'r Zog kütt" [The (carnival) train is coming], was released on record in the mid-1930s and went around the world.

Note: Translated from the German version of Wikipedia into English.