Operatic baritone Nathan Gunn has performed so frequently in Washington it is surprising to learn that his Washington National Opera, or WNO, concert Sunday is his debut with the company. Ever since honing his talents the summers of 1994 and 1995 as a member of the Wolf Trap Opera Company, he has performed for audiences all over the world with a repertoire that encompasses standard and new operas, recitals, Broadway classics and cabaret.

From Papagena and Figaro to Billy Budd and Clyde Griffiths in “An American Tragedy,” he becomes each character with astounding ease.