While Pope Francis has made no secret of his love of choirs, he has revealed why he may not always join in.

The pontiff told an audience of 6,000 young international choir singers Thursday that "I like to hear singing. But if I would sing, it would seem like a donkey."

Francis took questions from the youths, telling them that his childhood aspiration was to become a butcher and acknowledging he sometimes gets angry — "but I don't bite."

The choristers' organization, Pueri Cantores, has been holding its annual meeting in Rome this week. Some members will participate in New Year's Day Mass in St. Peter's Basilica.