"We were working on the assumption that we would have to cut of any trailing vowels and paste on "ist". So, from "viola" and "violin" we get "viol-" and "violin" (surprise). To that we add "-ist" for "violist" and "violinist". So, a "violist" would be someone who plays the viola, and a "violinist" would be someone who plays the violin. And they are."

Whence means that a player of the 'viol da gamba' is ...