Solresol
The goal of Sidosi is to be a comprehensive, up-to-date, and most importantly permanent resource for learning Solresol. Sidosi is currently home to the largest known active Solresol community, as well as the effort to build the world's first comprehensive Solresol translator. Sidosi also hosts a large archive of historical and modern documents about Solresol, as well as publishing its own documents.
Solresol is a constructed language that can be played on an instrument, as it is made up entirely out of music notes.
Sidosi.org was a website and community that collected and archived Solresol information aiming for further development of the language. However, it has languished and become abandoned. The Bibliotheca Anonoma aims to collect the information back in one place again.