Instrumental Duet,Viola,Violin - Level 4 - Digital Download SKU: A0.1248755 By Stephen Foster. By Stephen Foster. Arranged by Renato Segati de Moraes. 19th Century,Blues,Chamber,Country,Folk. 4 pages. Renato Segati #843249. Published by Renato Segati (A0.1248755). Arrangement of the Song Swanee River for Violin and Viola. This arrangement presents a diversity of contrasts and stylistic possibilities from the wonderful melody of this sweet song by Stephen Foster.