Instrumental Duet Clarinet,Instrumental Duet,Viola - Digital Download SKU: A0.837375 Composed by Elmer Bernstein. Arranged by Jonathan Allentoff. Contemporary. Score and parts. 2 pages. Allentoff Music #4803081. Published by Allentoff Music (A0.837375). To Kill a Mockingbird by noted Hollywood composer Elmer Bernstein, arranged for clarinet & viola by ASCAP/ASMAC composer Jonathan Allentoff.