That is very interesting. I have often wondered how and why Germany in the postwar period fully embraced that Octoberfest oompah sound.
It is also interesting how few compelling German pop stars existed during that period, at least from the standpoint of someone in the US. I have accumulated all kinds of postwar pop vocals from France, Italy, Spain, etc., but what was Germany producing? Hildegard Knef is the only singer from that period with whom I am really familiar. There is also Karel Gott, whose version of the Stones' "Paint It Black" must be experienced to be believed.
On the German volume of Get Easy, most of the singers are relatively unknown (in the US). Obviously, several of Germany's instrumental artists became relatively well-known. These would include MPS artists, and others such as James Last, Horst Jankowski, Berry Lipman, and of the course Thee Great Peter Thomas, whose Chariots of the Gods soundtrack would easily make my top 100 film score list.