A group of scales which use the same set of notes as the major scale, in the same order, starting from one of its seven degrees. 1. ionian (d-d’), 2. dorian (r-r’), 3. phrygian (m-m’), 4. lydian (f-f’), 5. mixolydian (s-s’), 6. aeolian (l-l’), 7. locrian (t-t’). The ionian mode is the same as the major scale and the aeolian mode is the same as the natural minor scale.