Hi! I’m a professional timpanist with a bachelors degree in music education. Buy your kids “two-pocket folders” from Amazon or you preferred local office supply store, and teach them the importance of organizing their sheet music. This is a skill they will need for their entire lives.

Now, to give you the self-hosted answer: forScore is seriously the best app in existence. It does so much more than just store sheet music. I personally use an app called Möbius Sync which uses syncthing under the hood, to sync my forScore files with my NAS. The only caveat to this system is you need to have the app open in order to sync files. Sucks I know.

Let me finish by saying that I strongly discourage you from giving your kids forScore, as it adds a mountain of complexity to their experience with music that they simply do not need in their lives right now. Buy them cheap two-pocket folders and chastise them for leaving their paper around the house like animals. If any of them ever study music in college, then at that would be the point at which using forScore becomes worthwhile.

P.S. thank you for being so supportive of your kids interest in music! It’s great to hear of a family whose children study so much music that it’s becoming a logistical concern, lol. We need more families like yours.