Chorale sings "O Great Mystery: A Service of Words and Music" View All Events The Saint Michael's College Chorale, directed by Professor Nathaniel G. Lew, offers its annual service of lessons and carols, featuring familiar carols and Christmas choral works, and the world premiere of Arma Lucis, an Advent processional by Trevor Weston, commissioned by the College for performance in the College Chapel, and the New England premiere of O Magnum Mysterium by renowned American composer Libby Larsen. College Organist Susan Summerfield, violinist Fran Pepperman-Taylor, and trumpeters Christopher Gribnau and Richard Steele join the Chorale for the performance.