Austria's entertainment culture is anchored by a classical music tradition of global significance. The Vienna Philharmonic, the Vienna State Opera, and the Wiener Musikverein — where the New Year's Concert broadcasts worldwide to an audience of 50 million — are the institutional pillars of a city whose music heritage includes Haydn, Mozart, Beethoven, Schubert, Brahms, and Mahler as former residents. The Salzburg Festival in July and August stages opera, theatre, and concert performances at the highest international level in a city whose association with Mozart is total. The Viennese ball season — hundreds of formal balls from November to March, organised by professional guilds and open to the public — is an entertainment tradition specific to Austria and to no other country in precisely this form.