Music Theory in 1963

CSM 3 Jacobus Leodiensis (Jacobus of Liège) (1260?-1330?), Speculum Musicae, Edited by Roger Bragard in 7 Volumes. Vol. III Liber Tertius: Volume 3 by Leodiensis, Jacobus

The Rhythmic Structure of Music by Cooper, Grosvenor, Meyer, Leonard B.