This week on Continuum Milton Scheuermann and Thais St. Julien present examples of the first forms of polyphony, music composed for two or more melodies performed at the same time. Various examples are presented, including 12th Century Polyphony in Aquitaine, music from the 12th century School of Notre Dame, hockets from the 13th century Bamberg Manuscript, and motets from the 13th century Montpellier Codex. Performers include Ensemble Organum, Theatre of Voices, and Anonymous 4. The music is from the CD, Harmonia Mundi - Century 5, from the ten CD set of Early Music on the Harmonia Mundi label.