Posts by John R. Stevenson

Introduction Émile Jaques-Dalcroze used the term espèce (French for “species”) to describe all varieties of pitch sets, including dichords, trichords, and heptachords (among others), which outline and define all qualities of seventh chords. To understand the espèces requires a thorough understanding of the do-to-do scales, pitch sets (dyads, trichords, etc.), and the four species of…