Which New Year's Eve concert tradition takes place at Vienna's Musikverein and is broadcast worldwide on January 1?

The concert tradition at Vienna's Musikverein that is broadcast worldwide on January 1 is the Vienna New Year's Concert.

The Vienna Philharmonic performs the concert in the Musikverein's Golden Hall. Its repertoire is strongly associated with the Strauss family, especially Johann Strauss II, and commonly includes waltzes, polkas, and marches. Although the concert is linked with New Year's celebrations, its main performance takes place on January 1 rather than New Year's Eve.

The tradition began during the Second World War, when the first concert was held on December 31, 1939. It moved to the January 1 date in 1941. The concert became an international broadcast event, with television and radio transmissions reaching many countries.

The Radetzky March is traditionally performed as an encore, with the audience clapping along under the conductor's direction. It is best known as a concert tradition, not as the name of the orchestra, the hall, or the march itself.