1. Catholic Music (1000 - 1300 CE): Early Polyphony

2. Organum / Ars Antiqua

3. Chronology Musica Enchiriadis (9C) Leonin[us] (1100s): “Viderunt omnes” [2- voiced organum] Perotin[us] (c. 1160- c. 1240): “Viderunt omnes” [4-voiced organum] (c. 1198) Guillame de Machaut (: “Messe de Nostre Dame”

4. Organum from Musica Enchiriadis (9C)

6. Troped Kyrie 2-voice Organum

7. Gradual for Christmas (3rd Mass): Viderunt Omnes

10. Perotin (d. 1200 / 1230) “Viderunt omnes” (1198)

12. Gradual for Christmas (3rd Mass): Viderunt Omnes

50. Guillaume de Machaut (c. 1300-1377) Messe de Nostre Dame (c. 1360)

51. Kyrie I (polyphony)

56. Kyrie I (chant)

57. Christe (chant)

58. Christe (polyphony)

63. Kyrie II (polyphony)

67. Kyrie II (chant)

68. Kyrie III (polyphony)

75. Kyrie III