To contribute to the Mozart festivities, Anne-Sophie Mutter and Lambert Orkis will play all of the composer's sonatas for piano and violin.

Five orchestras-in-residence — the Philadelphia Orchestra with Christoph Eschenbach; the Cleveland Orchestra with Franz Welser-M‹st; the Vienna Philharmonic with Nikolaus Harnoncourt, Valery Gergiev and HK Gruber; the Royal Concertgebouw Orchestra with Mariss Jansons; and the San Francisco Symphony with Michael Tilson Thomas — will play three concerts each.

The festival will present sixteen world-premiere performances, including works by Klaus Huber, Heinz Holliger and Hanspeter Kyburz.

Michael Haefliger is executive and artistic director of the festival, which runs through September 17.