1) Viola Clef Melody Parts: The Viola Melody parts are the same as the main melody part. 2) Viola parts: This is the Viola part of the String Arrangements. Introduction In this book are the Viola parts. 3) Viola parts on Bass: These are the lowest parts of the arrangements, the bottom note, made for Viola clef. The treble clef parts also should be able to be played on Viola.