Instrumental Duet,Piano Flute,Instrumental Duet,Piano,Viola - Level 2 - Digital Download SKU: A0.1212887 Composed by William Runyan. Arranged by Tyler Adams. Christian,Praise & Worship,Religious,Sacred,Traditional. 13 pages. Adams Arrangements #810100. Published by Adams Arrangements (A0.1212887). Great Is Thy Faithfulness warmly arranged as a duet for flute and viola with piano accompaniment.