The Polymnia choral ensemble, directed by Dr. Lorna C. Young-Wright, will perform Masses by Mozart and Schubert at a concert Saturday, Dec. 18, at Nisky Moravian Church, worked the group performed at their much-acclaimed Paris concert in July. Holiday music is promised as well. Tickets are $20 and may be purchased from Polymnia members or at the door. For details see the article in St. Thomas Source's Music section.