Sing along with Boethius
1.° Institutionis musicae libri quinque : authore Boëtio. — 2.° Enchiridion musicae : authore Uchubaldo, Francigena.
Source: gallica.bnf.fr
Bibliothèque nationale de France, Département des manuscrits, Latin 7202, fol. 26r.
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