The Trenton Youth Orchestra and Trenton Youth Singers will present their annual winter concert, “”It’s the Most Incredible Time of the Year,” at 7:30 p.m. Sunday, Dec. 8 in Rocky Common Room. As part of the Trenton Arts @ Princeton Saturday morning program, the Trenton Youth Orchestra and Trenton Youth Singers provide free musical instruction, programming, and performance opportunities for students from Trenton public schools. Trenton Arts @ Princeton is supported by the Department of Music, Princeton University Concerts, Pace Center for Civic Engagement, and Gustavo Dudamel Foundation.