'Ars musica' Attributed to Magister Lambertus/Aristoteles

The treatise on musica plana and musica mensurabilis written by Lambertus/Aristoteles is our main witness to thirteenth-century musical thought in the decades between the treatises of Johannes de Garlandia and Franco of Cologne. Most treatises on music of this century - except for Franco‘s treatise on musical notation - survive in only a single copy; Lambertus‘s Ars musica, extant in five sources,...