Corbin The Violist

@Morgri
Extremely difficult???

Are we speaking about a professional or advanced level violist??

If yes, than no.

Thirds, sixths and fifths, are like the most commonly asked intervals. I've seen harder etudes in terms of double stops.

@The piece.
There are some issues with double stops regardless. There is usually a progression in positions with double stops like this, your writing jumps all over the place or uses open strings in the double stops. There are some notation errors in the double stops too.

I'd give you some exact parts, but this is just general.

The cadenza writing was mediocre. I think you'd need some editing by someone who knows the instrument better.

Just some notation errors in general as well.

Hmmm... I didn't like the first movement at all. The movements actually got better as you move on. I think you should seriously rework the 1st movement.

Look at some music by Bax, Bowen, and others like that. Very good modern/ romantic viola examples.