unisono Deutsche Musik- und Orchestervereinigung eV (until October 2022 Deutsche Orchestervereinigung , short DOV ) is the professional association and trade union for musicians in municipal, state and state orchestras, radio orchestras, big bands and for radio choir singers, freelance musicians as well Lecturers and students at music colleges. The union, founded in 1952, cooperates with the German Cultural Council, the United Service Union and numerous other associations and institutions, such as B. the German Music Council . Almost all members of German professional orchestras belong to itradio choirs , a total of about 12,800 people.