Composer Marco Catella will present the world premiere of his new opera “Prince Cnut” on Feb. 19 and 20 at 7:30 p.m. at the Theater at St. Jean in New York City. “Prince Cnut” is an original opera with a libretto by Juan E. Batalla inspired loosely by historical elements from the story of King Cnut, an 11th-century Danish king {…}