Over the past three hundred years, about two hundred projects of artificial languages were invited. Unfortunately, all of them were fallen into oblivion, as have been unsuccessful. An interesting musical language, called “sol-re-sol” was created in 1817.
The author was a Frenchman, Jean Francois Syudr. He published the rules of their language in 1817. For forty years, his followers developed a grammar, vocabulary, and theory of the language. In 1868 in Paris, there were writings some compositions using that language.