Let It Snow!

Snow from every possible angle: Frozen and The Snowman beside “In the Bleak Midwinter,” the Ukrainian Bell Carol, and settings of Rossetti and Sara Teasdale, with a twelve-piece orchestra — strings and all — and the Arts Barn Dancers drifting through “The Snowflake.” The most chamber-concert evening the chorus has staged, and still room for “Baby, It’s Cold Outside.”