Tradition is getting a bit of a boot at the Salzburg Festival this year. Rock music will jolt the Austrian city where Mozart was born.

In addition to performances of Verdi and Wagner and concerts by the Vienna Philharmonic Orchestra at the festival, artistic director Gerard Mortier will stage the world premiere of "Soon," a rock musical.But the city remains a bastion against the full onslaught of the 20th century. "It is not yet time to invite the Spice Girls to Salzburg," Mortier said.