Django Music Publisher - OSS
Django-Music-Publisher (DMP) is open-source software for original music publishers. It is a tool for managing metadata for musical works and recordings, including data about writers, recording and performing artists, albums and music libraries. The information about it is spread over several websites and YouTube playlists.
The official documentation is on ReadTheDocs: https://django-music-publisher.readthedocs.io. It includes instructions on how to deploy it to the free Heroku tier and a user manual.
There is a Youtube Playlist about Django Music Publisher, including short tutorials.
The content about DMP on this website gives additional information e.g. origins, underlying motives and plans for the future.