Publisher Desc. From the smallest parish to the grandest cathedral, Celtic Mass has nourished worship communities for years. Rest assured, the revised version will continue to do the same. Your parishioners will enjoy singing familiar melodies. They'll also discover new surprises that feel like they've always been there. Choral and instrumental parts have been rewritten for the new sung parts, but most of the music you cherish remains. Striking a delicate balance between new and old, Christopher has provided you with an effective resource to prepare your community for the new Roman Missal.