This, the first issue in the series, makes Ockeghem's contrapuntal tour-de-force available in a modern edition for the first time. With its remarkable Prolation (the simultaneous use of different time signatures) and ingenious construction as a series of single and double canons encompassing every interval of the diatonic scale, the work is an effortless demonstration of the art of counter-point.

Fazer Editions of Early Music is a choral series under the editorial supervision of Paul Hillier, founder and artistic director of the renowned Hilliard Ensemble. Although each title in this series is the result of careful scholarly research and is a reliable source for musicologists, the series' main purpose is to make practical performing editions available to choirs and other vocal ensembles. The original C clefs have been replaced by G and F clefs and the note values adapted to conform to modern practice. All the works in the series are intended for mixed voices. Each title includes a lengthy introduction in English and notes on the editorial principles. Where necessary, an English translation of the text and a guide to pronunciation are provided.