Works great (well, aside from one niggle below)! I'm not exactly sure how @jdstrand put different instruments on the different clefs of the grand staff but OK. What an aweeeesome snap though, thanks so much! Maybe worth passing to upstream unless they don't want it (after more testing, obviously)?
It really irritates me that by default when you open a dialogue to open/save in a snap app, it often opens a directory inside the snap folder (happens with LibreOffice too). This is not very user-friendly!
In the case of MuseScore, it opens
~/snap/musescore/1/Documents/MuseScore2/Scores. So if someone saves here, presumably when the snap is updated their scores would then save in the revision 2 folder and they'll wonder where all their scores have gone.
Maybe there's some environment variable that can be set to change the folder that is opened when a open/save dialogue is first used, or maybe it's hardcoded into MuseScore, I don't know. Maybe should just open
Here's a little composition I made whilst to testing this snap, you probably won't appreciate it unless if you've heard of a lad called Arnold Schoenberg...