The Dallas Opera will mark its 50th anniversary next season with its first-ever stagings of Verdi's Nabucco, Donizetti's Maria Stuarda, Puccini's La rondine and Wagner's Lohengrin. The 2006-07 season will also include a non-subscription concert performance, on January 17, 2007, of Bart‹k's Bluebeard's Castle starring mezzo-soprano Denyce Graves. The season opens on November 10, 2006, with Nabucco, in a new production directed by James Robinson, the artistic director of Opera Colorado. Dallas Opera music director Graeme Jenkins conducts.