Scale Detail
C# Locrian — C# C♯ Locrian
The C# Locrian scale is the seventh and most unstable mode of the major scale. With a flat second and flat fifth above the root, it creates a diminished tonic — the only mode that cannot easily establish tonal stability, making it theoretical but powerful for tension.
Formula: H – W – W – H – W – W – W
Extremely unstable, dark, dissonant, and theoretical. The only mode without a perfect fifth above the root.
The Locrian mode starts on the seventh degree of the major scale. Its formula H–W–W–H–W–W–W produces the most dissonant of all diatonic modes. Starting on C#, this gives C#, D, E, F#, G, A, B. The two defining characteristics are: (1) a minor second above the root (just one semitone up, like Phrygian), and (2) a diminished fifth — the root chord is a diminished triad, making it impossible to establish a stable tonal center. In practice, pure Locrian is rarely used melodically because the ear constantly wants to resolve away from the tonic. However, the Locrian mode is theoretically important: it corresponds to the vii° chord in major keys and to the iiø7 chord in jazz (the half-diminished chord). Jazz musicians occasionally improvise in Locrian over half-diminished chords in minor ii–V–i progressions.
Locrian is the most harmonically unstable mode, built on the 7th scale degree. Its tonic chord is diminished — there is no stable home — which is why it's rarely used melodically but powerful for creating extreme dissonance and unsettled energy.
🌑 Other dark sounds to explore
Every diatonic chord naturally occurring in C♯ Locrian Scale:
Sonic Identity
Locrian is the most harmonically unstable of the seven modes — its tonic chord is diminished, meaning there is genuinely no stable resting point anywhere in the scale. Everything in Locrian feels dissonant, unmoored, and perpetually unresolved. Unlike modes that create tension before releasing it, Locrian maintains a state of pure instability: it is the sound of theoretical completeness and practical extreme dissonance.
How Harmony Works
The i° chord (diminished tonic) provides no harmonic rest — a diminished fifth at the root means home is never stable. The ♭II chord is the most stable chord in Locrian, which is why many Locrian passages treat ♭II as the practical tonal center, creating a ♭II–i° cadential motion. Without a perfect fifth above the tonic (replaced by ♭V), all normal harmonic reference points shift. In jazz, Locrian is used specifically for the half-diminished iiø7 chord in minor ii–V–i progressions — its distinctive dissonance is harnessed briefly before moving to the dominant.
Common Uses
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