Available for Two Violins, Two Violas, Two Cellos. There are 4 volumes of increasing difficulty, Each book is in score form and the parts are interchangeable. So if you have Book 3 for Two Cellos, and Two Violas, either instrument can play part 1 or 2 and be able to follow where the other instrument is. Good options for those easing into ensemble settings. Priced per book. Just contact us with any questions.