French Horn Duet Horn - Level 4 - Digital Download SKU: A0.1152816 Composed by Michael W. Smith. Arranged by Fabio Britto. Christian,Praise & Worship,Religious,Spiritual,Wedding. Score. 4 pages. Fabio Britto #753055. Published by Fabio Britto (A0.1152816). Arrangement of the song Agnus Dei (Michael W. Smith) for Horn in F Duo. #gospel #michaelwsmith #christian.