In its 15th season, the Virginia Arts Festival welcomes the acclaimed Kalichstein-Laredo-Robinson Trio back to Hampton Roads. Their concert will offer music of Beethoven, Tchaikovsky and Richard Danielpour. The Danielpour piece, titled "Inventions on a Marriage," receives its world premiere at the American Theatre concert. It was written especially for two members of the KLR Trio, cellist Sharon Robinson and violinist Jaime Laredo. Dwight Davis spoke with Mr. Danielpour about the work.