A♭ Locrian Mode

Notes in the A♭ Locrian Mode

Interval Pattern

Chords Built on Scale Degrees

Key Signature

4 ♭ — The A♭ key signature uses B♭, E♭, A♭, D♭.

A♭ Locrian Mode in Practice

The A♭ Locrian Mode uses the key signature of 4 flats (B♭, E♭, A♭, D♭). Ab major has four flats and a full, somewhat dark sound. It is a common key in Romantic piano music and is frequently encountered in orchestral and choral writing. On guitar, A♭ positions offer comfortable transposing instrument keys 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 A♭, the 7 notes are A♭, A, C♭, D♭, D, F♭, G♭. In this key the signature has 4 flats (B♭, E♭, A♭, D♭). Ab major is a favored key for Romantic piano music, where the mix of black and white keys creates a comfortable hand shape for flowing arpeggios. Pop ballads and R&B songs frequently use Ab because vocalists find the key sits well in the middle of their range, and the rich sonority suits emotional delivery.

Tuning Frequencies Across Temperaments

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

Related Scales

Transposing Instruments: A♭ Locrian Mode

A♭ is a natural key for B♭ instruments (trumpet, clarinet, tenor sax), which sound a major second lower than written. B♭ instruments reading in C produce A♭ concert pitch. E♭ instruments (alto sax, baritone sax) reading in A♭ sound a major sixth lower.