Tonus Peregrinus: The History of a Psalm-tone and its use in Polyphonic Music

Mattias Lundberg investigates the historical role of a deviant psalm-tone, the tonus peregrinus, focusing on its applications in polyphonic music within all major branches of Western liturgy. Throughout the remarkably persistent tradition of applying this melody to polyphony, from the ninth century right up to the twenty-first, coeval music theory is able to shed light on the problems it has posed to modal and tonal practice at various historical stages.