"The Bergen Philharmonic is one of Norway's unique cultural treasures," Litton said. "The level of musicianship and dedication is prodigious. I cannot overstate my joy in working with such colleagues in such a wonderful environment."

In addition to his new duties, which include 10 weeks of concerts and long-term planning and programming, Litton will continue as artistic director of the Minnesota Orchestra's Sommerfest. He leaves the Dallas Symphony next year after 12 years.

The orchestra's 2005-06 season marks its 240th anniversary, which makes it one of the world's longest-running orchestras. The season's programming includes a performance of Mahler's Symphony No. 8 at the Bergen International Festival; recordings of Prokofiev's Romeo and Juliet and piano concertos by Alnaes and Sinding, two Norwegian composers; and tours to be announced later.