Participate in the sounds of the season with a Kate holiday tradition. Open to all who want to sing-along, the MessiahSing combines Cappella Cantorum’s professional soloists with a chorus of talented volunteers. Sit in the back and listen or sit down front and participate. Singers should arrive at 3:30 for section seating and rehearsal. Sit in the back and listen. 10th Annual MESSIAH Sing or Listen, sponsored by Cappella Cantorum, Sun., Dec. 16, singers rehearse 3:30 pm in sections. 4:00 pm perform…