C Locrian Mode

Notes in the C Locrian Mode

Interval Pattern

Chords Built on Scale Degrees

Key Signature

No sharps or flats — C Locrian Mode uses the same key signature as C major.

C Locrian Mode in Practice

The C Locrian Mode uses the key signature of no sharps or flats. C major is the simplest key signature with no sharps or flats. It is the starting point for music theory and the most widely studied key in Western music. On guitar, C positions offer open-string resonance for fingering positions for this scale.

The Locrian mode is the darkest and most dissonant of all modes, featuring a flat 2nd and flat 5th. It is rarely used melodically but appears in jazz as the basis for half-diminished harmony. When played starting on C, the 7 notes are C, C♯, D♯, F, F♯, G♯, A♯. In this key the signature has no sharps or flats. C is the home key of the piano, requiring no black keys for the major scale, and is the default key for most music theory instruction. Beginners typically start in C because its lack of accidentals makes sight-reading, transposition exercises, and harmonic analysis straightforward.

Tuning Frequencies Across Temperaments

Frequencies shown at A=440 Hz. View full temperament data for any note.

Related Scales

Guitar: C Locrian Mode Positions

The C key offers open-string resonance (no sharps or flats) on guitar. Sharp-side keys like C are idiomatic guitar keys because open strings (E, A, D, G, B, E) align with the scale's natural resonance points.