NEUMA is a digital library that aims at publishing on-line  rare corpora of music. We maintain and develop collections of scores with a clear and flexible organization based on interrelated corpus, so that users can easily browse, search and access them. NEUMA is also an open platform: as a user, you can get an account, create your own corpora and enrich them with new scores, annotate existing scores, and, overall, contribute to the collaborative effort of publishing beautiful but hardly accessible music works. Welcome to NEUMA!