A Chromatic Scale

Notes in the A Chromatic Scale

Interval Pattern

Harmony

The chromatic scale contains all 12 pitch classes and has no diatonic harmony, all chromatic passages use all pitches equally. See individual chord types for specific harmonic structures.

Key Signature

3 ♯ The A key signature uses F♯, C♯, G♯.

A Chromatic Scale in Practice

The A Chromatic Scale uses the key signature of 3 sharps (F♯, C♯, G♯). A major has three sharps (F#, C#, G#) and a bright, clear sound. It is extremely common in popular music and rock, particularly on guitar, and is easily sung by most voices. On guitar, A positions offer open-string resonance for fingering positions for this scale.

The chromatic scale includes all 12 pitches within an octave, each a half step apart. It has no tonal center and is used as a reference for all other scales and as a compositional device. When played starting on A, the 12 notes are A, A♯, B, C, C♯, D, D♯, E, F, F♯, G, G♯. In this key the signature has 3 sharps (F♯, C♯, G♯). A is the universal tuning reference pitch (A440) and sits naturally on guitar, mandolin, and violin as an open string. Blues guitarists gravitate toward A because the open A string provides a driving bass note for shuffle rhythms and the standard blues box pattern sits comfortably in fifth position.

Tuning Frequencies Across Temperaments

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

Related Scales

Guitar: A Chromatic Scale Positions

The A key offers 3 sharps (F♯, C♯, G♯) on guitar. Sharp-side keys like A are idiomatic guitar keys because open strings (E, A, D, G, B, E) align with the scale's natural resonance points.