Holiday for Three
These arrangements are completely interactive between the Violin, Viola, and Cello versions - in other words, they are in the same key and the parts can be swapped out between the different instrumental types.
For many of these arrangements, the first stain is a standard, traditional rendering - one could play the opening section as a simple performance of the carol.
The string parts are composed to stand alone or, of course, played with or without piano accompaniment.