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Chartwell/Books/Music/Theory/mode_rules.txt
2026-04-13 14:20:04 -04:00

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TITLE: Mode Rules
DOMAIN: Music Theory
TYPE: rule
PRIORITY: high
CONCEPTS: intervals, whole step, half step, semitones, scale construction, modes, ionian, dorian, phrygian, lydian, mixolydian, aeolian, locrian, diatonic theory
SCOPE: scale_construction
Mode Interval Definitions
W = whole step = 2 semitones
H = half step = 1 semitone
Scale Construction Rule
To construct a scale start on a root note and apply the interval formula step by step.
Ionian
Formula: W W H W W W H
Description: major scale
Dorian
Formula: W H W W W H W
Description: minor with raised sixth
Phrygian
Formula: H W W W H W W
Description: minor with lowered second
Lydian
Formula: W W W H W W H
Description: major with raised fourth
Mixolydian
Formula: W W H W W H W
Description: major with lowered seventh
Aeolian
Formula: W H W W H W W
Description: natural minor
Locrian
Formula: H W W H W W W
Description: diminished with lowered second and fifth