Instrumental Duet Cello,Instrumental Duet,Viola - Level 3 - Digital Download SKU: A0.939858 Composed by Richard St. Clair. 20th Century,Concert,Contemporary,Graduation. Score and parts. 23 pages. Richard St. Clair #6014767. Published by Richard St. Clair (A0.939858). These 11 canons for Viola and Cello are suitable for concert performance as well as teaching pieces for string students.