Morrison and his frequent scene partner Kelli O'Hara will perform a Christmas concert with the New York Pops at Carnegie Hall.
Broadway vets including Victoria Clark, Lauren Worsham, and Marc Kudisch also took part in the evening.
Jeers turn to cheers when the comic legend dresses his blasphemous Life of Brian in coat and tails.
The Collegiate Chorale presents the musical, inspired by the film Life of Brian, at Carnegie Hall.
The six-time Tony winner has had an unforeseen scheduling change.
The concert will be part of McDonald's nationwide tour.
The Pops will pay tribute to the Broadway siblings and their many musicals.
Ted Sperling will direct the Collegiate Chorale's event at Carnegie Hall.
Photos from the one-night-only concert production directed by Jack O'Brien.
The production also features Patrick Wilson and Sierra Boggess.