I was recently asked to produce a version of Bach’s famous "Air" from the Third Orchestral Suite for performance by a string trio. The violin part (with the addition of one double stop) remains basically unchanged from the original. The cello part is completely unchanged. The viola part, however, takes on the entire middle "filling", covering both its previous original part as written by Bach, as well as that of the second violin in the original. This requires an extensive use of double stopping, and some playing of two polyphonic parts simulraneously. While challenging, it can be done, and suggested fingerings for some of the more complicated passages are provided.