Three selections scored for 2 Tpts (Bb or C), 2 Tbns, Organ, Opt. Timp. Opt. SATB introduction for Lasst uns erfreuen. LASST UNS ERFREUEN - NICAEA - HYFRYDOL All eight volumes of John Ferguson's Festival Hymns for Organ, Brass, and Timpani are instrumental arrangements designed to enhance congregational singing. They work perfectly with any worship aid.