What Does Diatessaron Mean?

The Greek term diatessaron is used in music as a synonym for the interval of the perfect fourth, dia meaning “over”, tessaron “four”. See also hemidiapente, diapente and diapason. (Very) Select Bibliography Baragwanath, Nicholas. Note-Naming, Galant Schemata, and the “Thread” of Vivaldi’s Concerto for Four Violins, Op. 3 No. 10 (RV 580), in: Music Theory [ ]