OckeghemÕs Missa cuiusvis toni (Mass in any mode) has fascinated musicians, historians, and theorists since the fifteenth century. It is performable in several different modes, each of which has its own character. There are relatively few cadences, so that long stretches of the music flow with little interruption, a feature of OckeghemÕs music some consider almost mystical.In this first comprehensive edition, the singersÕ parts (SATB) appear in mensural notation in order to encourage performance of the mass from its original notation, but Houle also provides full scores and parts in modern notation for the Phrygian, Mixolydian, Lydian, and Dorian modes. The two versions correspond note for note so that singers can easily refer to the transcribed parts.Missa cuiusvis toni offers singers brilliant counterpoint, a masterful exercise in solmization, and experience in Musica ficta. It offers audiences a work of great beauty and an unparalleled exploration of the colors and emotive shadings of the modes.