Brass musicians in this city’s main orchestra exclusively use its namesake double-piston valve played via a rotary attachment. In a genre from this city, musicians create a signature “dragging” by playing the second beat slightly early and the third beat slightly late. Pre-recorded videos of this city’s state ballet are broadcast alongside an annual concert in this city’s (10[1])Golden Hall. A solo horn plays an A major arpeggio to open a piece written by a prolific composer (10[1])from this city, who also wrote pieces named for this city’s “blood” and “woods.” The (10[1])audience (10[1])claps along (10[1])during (-5[1])the second of two permanent encores that end a New (10[1])Year’s concert (-5[1])held in this city’s Musikverein (“moo-ZEEK-veh-ryne”), the Radetzky March. For 10 points, name this city where Johann Strauss, Jr. composed On the Beautiful Blue Danube and other waltzes. ■END■ (10[2])