Why did Nazis ban jazz music?

Basically, Jazz music is "Negroid" music, Hitler banned all music composed by Jews, Black people or even anything that was too experimental, as we know he was very racist and anti semetic and used propoganda to prevent Germany being influences by anything non aryan. In 1938 he held the exhibition of degenerate music, to condemn Jazz music further. The German classical musician Mendelssohn was prohibited because he was Jewish. Hitler prefered Germany to listen to romantic German classical music, to encourage nostalgia and preserve old traditions. Wagner and Strauss were his personal favourites.