Viola Duet Viola - Level 4 - Digital Download SKU: A0.1152759 Composed by Michael W. Smith. Arranged by Fabio Britto. Christian,Praise & Worship,Religious,Spiritual,Wedding. Score. 4 pages. Fabio Britto #752995. Published by Fabio Britto (A0.1152759). Arrangement of the song Agnus Dei (Michael W. Smith) for Viola Duo. #gospel #michaelwsmith #christian.