I don't think this concept is feasible without a mammoth effort of work. However, this may pique your interest Keiran:
https://www.smashingmagazine.com/2018/03/web-midi-api/ Nothing is impossible. Is it that you want more than one person to edit the LilyPond source simultaneously? Sounds like a recipe for chaos to me. [I am not fully comprehending this idea of yours.] Why could you not have the source file on say Google Drive, reflected to the local computer, and edit with local LilyPond/Frescobaldi? Save back to drive, for all to see and use. [Raises my questions about file locking protocol etc, but this would work, at the very least.] If cost of GD for students is an issue, I run NextCloud on my Linux Servers. It's just the same, if not better, and it's open source. Only cost is my server monthly cost, which would be a component of any solution in any case, regardless. Andrew > On Fri, Oct 23, 2020 at 13:35, Kieren MacMillan > <kieren_macmil...@sympatico.ca> wrote: > > > The app/site *must* allow entry of notes using either a MIDI keyboard or a > > "Quick Entry" (mouse-click) type UI; drag-and-drop would obviously be a > > bonus, but is hardly necessary.