Music Theory in 1977

CSM 25 Amerus (13th C.), Practica Artis Musice, Edited by Cesarino Ruini: Volume 25 by Amerus

CSM 26 John Hothby (D. 1487), de Arte Contrapuncti, Edited by Gilbert Reaney: Volume 26 by Hothby, John

CSM 27 Johannes Vetulus de Anagnia, Liber de Musica (14th C.), Edited by Frederick Hammond: Volume 27 by Vetulus de Anagnia, Johannes