Guillaume de Machaut is the most important poet and composer of late medieval France. His unique and inventive output is the subject of this new, integrated edition of Machaut’s complete poetry and music. Volume 1, The Debate Series, presents the two judgment poems, which are among his most important artistically in terms of their formal innovations and their influence on contemporaries, notably Geoffrey Chaucer, and the associated Lay de plour, presented here with its music. This volume includes the French originals and facing English translations.