NOTE: The D final modes (Dorian and Hypodorian) are known as the Protus modes. The E final modes (Phrygian and Hypophrygian) are known as the Deuterus modes. The F final modes (Lydian and Hypolydian) are known as the Tritus modes. The G final modes (Mixolydian and Hypomixolydian) are known as the Tetrardus modes. Click here to see various chants on which to practice identifying modes.