BF78 - Compatible Duets for Strings: Viola. 31 Duets that can be played by any combination of string instruments. Arranged or composed by Larry Clark, transcribed and edited by Doris Gazda. This collection contains 31 duets in a variety of styles from classical to folk music to original pieces that will be fun to play with any combination of two string instruments. The flexibility of these duets make them a must-have fo any string player.