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Whole Tone and Diminished Scales
Builds on Melodic Minor Modes
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Symmetric scales repeat the same interval pattern all the way around the octave, which means they have no single strong 'home' tonic the way major or minor scales do — every starting point sounds equally plausible as the tonic.
The whole tone scale stacks six whole steps in a row (only two whole-tone scales exist in total, since starting on any of its six notes just gives you the same six pitches again). The diminished scale alternates whole and half steps around the octave in one of two orders — half-whole or whole-half — producing eight notes total, commonly used over dominant 7th and fully diminished 7th chords respectively.
⚠️ Common mistake
Trying to assign a single obvious tonic to a symmetric scale the way you would for major or minor. Their whole appeal — and their identifying feature — is that repeated symmetry; there often isn't one uniquely 'correct' resting note.
📝 Summary
Symmetric scales repeat one interval pattern around the octave with no single strong tonic: whole tone (all whole steps) and diminished (alternating whole/half steps, in half-whole or whole-half order).
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