Sunday, December 18
Renaissance Voices, an a cappella ensemble 20 singers strong, performs Christmas songs from its namesake era, as well as a few carols and more contemporary holiday fare, Dec. 17 (at 7:30 p.m.) and today at 2 p.m. at the “beautiful and resonant” Cathedral of St. Luke (143 State St., Portland). Tix: $12-$15 ($5 students). 729-4958. renaissancevoices.net.