Why were the Jewish musicians not allowed to play music by Beethoven in Chapter 4 of Night?

To understand the reasons why Jewish musicians were not allowed to play music by Beethoven as described by Elie Wiesel in Night, it is important to comprehend the Nazi agenda. Hitler and members of the Nazi party had agreed to purge the Jewish community, among other groups termed undesirable, from humanity. The hatred towards these communities was extreme, and the Nazis made this clear by subjecting millions to forced labor and mass killings (holocaust). Basically, what they were communicating through their actions was that Jews and other "undesirables" were undeserving of life. For this reason, they were also undeserving of the German culture. It was an insult to the Nazis for a Jew to play German music (Beethoven was a German composer and musician). The Jews were considered inferior and subordinate to the Nazi Germans.

In Night, Elie met some musicians while at one of the concentration camps. The musicians, who were previously popular, and possibly played in front of German audiences, were barred from playing Beethoven or German music in general. This was an extension of the Nazi agenda, to prove to the Jews that they were undeserving.

We struck up conversations with our neighbors, the musicians. Almost all of them were Jews. Juliek, a Pole with eyeglasses and a cynical smile in a pale face. Louis, a native of Holland, a well known violinist. He complained that they would not let him play Beethoven; Jews were not allowed to play German music. Hans, the young man from Berlin, was full of wit. The foreman was a Pole: Franek, a former student in Warsaw.