Cantus firmus Masses were hugely popular in France and the southern Netherlands in the 15th century, but the very first example was probably written by an Englishman named Leonel Power. We'll hear that work, his Missa Alma redemptoris mater, plus motets by John Dunstable, Power's younger contemporary who changed the face of music on the continent with the contenance angloise, or "music in the English manner." 

• Anon.: Hostis Herodes Impie. Performed by Fount and Origin.
• Anon.: Singularis laudis digna. Performed by The Hilliard Ensemble.
• Anon.: Tu civium primas. Performed by The Hilliard Ensemble.
• Anon.: Mater Christi nobilis. Performed by The Hilliard Ensemble.
• Leonel Power: Salve Regina. Performed by The Hilliard Ensemble.
• Leonel Power: Ave Regina coelorum. Performed by The Hilliard Ensemble.
• Leonel Power: Gloria. Performed by The Hilliard Ensemble.
• Leonel Power: Beata Viscera. Performed by The Hilliard Ensemble.
• John Dunstaple: Alma Redemptoris Mater. Performed by The Hilliard Ensemble.
• John Dunstaple: Gaude Virgo salutata. Performed by The Hilliard Ensemble.
• Leonel Power: Missa Alma Redemptoris Mater (selections). Performed by The Hilliard Ensemble.