Instrumental Duet Instrumental Duet,Organ,Viola - Level 3 - Digital Download SKU: A0.650436 Composed by Camille Saint-Saens. Arranged by Nick Lacanski. Concert,Instructional,Romantic Period,Standards. Score and parts. 25 pages. Theupperstaff #6497639. Published by theupperstaff (A0.650436).