"The Los Angeles Ballet launched its inaugural season at the Beverly Hills Wilshire Theatre with an original production of 'The Nutcracker.' In a landmark first, 22 live musicians were augmented by 33 virtual players to round out the 55 musicians called for by the Tchaikovsky score."
Ends up they only had room in the orchestra pit for 22 players yet wanted to play the full score - so they augmented real players with virtual players using Garritan Personal Orchestra (Learn more | Buy ).The software instrument was hosted out of Sonar 6 Producers Edition (Learn More | Buy ). Gary Garritan even helped with the production.
The story also indicates that the "Musician’s Union Approves Landmark Use of Garritan Personal Orchestra" :^).