avoid note
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Taking C major as an example, the avoid notes are:
table:Avoid notes for modes of the C major scale
Scale degree Chord Mode Avoid note Available tensions
1 Cmaj7 Ionian Fourth scale step, F 9, 13
2 Dm7 Dorian Sixth scale step, B 9, 11
3 Em7 Phrygian Second and sixth scale steps, F and C 11
4 Fmaj7 Lydian No avoid note 9, ♯11, 13
5 G7 Mixolydian Fourth scale step, C 9, 13
6 Am7 Aeolian Sixth scale step, F 9, 11
7 Bø7 Locrian Second scale step, C 11, ♭13