What is the name of the famous New Year's Eve concert held annually in Vienna by the Vienna Philharmonic?

The famous annual concert held by the Vienna Philharmonic is the Vienna New Year's Concert.

The concert takes place in Vienna's Musikverein and is best known for music by the Strauss family, especially Johann Strauss II. Its program traditionally includes waltzes, polkas, and marches, culminating in familiar encores such as “The Blue Danube” and the “Radetzky March.”

The first concert in the modern tradition was held on December 31, 1939; it moved to New Year's Day in 1941. It is now broadcast internationally, giving the event an audience far beyond the concert hall.

The concert is sometimes casually called the Strauss concert, but that is not its official name. The Vienna Philharmonic performs it under a different conductor each year, making the conductor and exact program variable rather than part of the answer.