An in-depth study of the Bulgarian harmonic system is long overdue. More than two decades since the Le Mystere des Voix Bulgares choir was awarded a Grammy (1990), there is no scholarly study of the captivating sounds of Bulgarian vertical sonorities. Kalin Kirilov traces the gradual formation of a unique harmonic system that developed in three styles of Bulgarian music: village music from the 1930s to the 1990s, wedding music from the 1970s to 2000, and choral arrangements (obrabotki) - creations of the socialist period (1944-1989), popularized by Le Mystere des Voix Bulgares. Kirilov...