I wanted a "Google Docs for sheet music": open a browser tab, start writing notation, share a URL, and have someone else edit the same score with you in real time. Nothing like that existed. MuseScore, Finale, and Sibelius are all excellent, but they're desktop apps built for people who already...
Source: [Dev.to](https://dev.to/tan-z-tan/i-built-a-real-time-collaborative-sheet-music-editor-heres-what-musicxml-and-crdts-taught-me-1dii)