Mode 1 of Gregorian Chant: Authentic Dorian
Mode 2 of Gregorian Chant: Hypodorian or Plagal Dorian
Mode 3 of Gregorian Chant: Authentic Phrygian
Mode 4 of Gregorian Chant: Hypophrygian or Plagal Phrygian
Mode 5 of Gregorian Chant: Authentic Lydian
Mode 6 of Gregorian Chant: Hypolydian or Plagal Lydian
Mode 7 of Gregorian Chant: Authentic Mixolydian
Mode 8 of Gregorian Chant: Hypomixolydian or Plagal Mixolydian