Posted on May 17, 2017July 19, 2017 by adminComposition | Choral || O magnum mysterium O magnum mysterium Andrew E. Clarkson SATBwith organ 4′ 45″ ModeratelyChallenging Christmas | Advent $ 2.00 ‘O magnum mysterium’ by Andrew E. Clarkson SATB with organLength = 4′ 45″ | Level = Moderately ChallengingChristmas | Advent $ 2.00 per copy