Burgundian School
"L'homme armé" (French for "the armed man") is a Burgundian School secular song from the time of the Late Middle Ages. According to Allan W. Atlas, "the tune circulated in both the Mixolydian mode and Dorian mode (transposed to G)." It was the most popular tune used for musical settings of the Ordinary of the Mass: over 40 separate compositions entitled "Missa L'homme armé" survive from the period.