Instrumental Duet Instrumental Duet,Viola,Violin - Level 3 - Digital Download SKU: A0.837350 Composed by Richard Rodgers. Arranged by Jonathan Allentoff. Broadway,Film/TV. Score and parts. 5 pages. Allentoff Music #3120757. Published by Allentoff Music (A0.837350). Oh, What a Beautiful Mornin' from Oklahoma by Rodgers & Hammerstein, arranged for violin and viola by ASCAP/ASMAC composer Jonathan Allentoff. Two minutes in length, this setting is perfect for any performance.