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A° Chord on Guitar

A° is the A diminished chord — 3 notes (A, C, E♭) built from the formula 1 ♭3 ♭5. Below are playable shapes across the fretboard, the keys it belongs to and the scales to use when soloing over it.

Notes: A · C · E♭Formula: 1 · ♭3 · ♭5Hear it and see it on the fretboard ▸

A°: Chord shapes (open & barre)

  • A° – open position×R♭5R♭3×open position
  • A° – fret 44××R♭3♭5Rfret 4
  • A° – fret 77××R♭5R♭3fret 7
  • A° – fret 1212×R♭5R♭3×fret 12

A°: Triad voicings (3 strings)

  • A° – bass: RR♭3♭5×××bass: R
  • A° – bass: R8×R♭3♭5××bass: R
  • A° – bass: R4××R♭3♭5×bass: R
  • A° – bass: R11×××R♭3♭5bass: R
  • A° – bass: ♭36♭3♭5R×××bass: ♭3
  • A° – bass: ♭3×♭3♭5R××bass: ♭3
  • A° – bass: ♭38××♭3♭5R×bass: ♭3
  • A° – bass: ♭3×××♭3♭5Rbass: ♭3
  • A° – bass: ♭510♭5R♭3×××bass: ♭5
  • A° – bass: ♭55×♭5R♭3××bass: ♭5
  • A° – bass: ♭5××♭5R♭3×bass: ♭5
  • A° – bass: ♭58×××♭5R♭3bass: ♭5

Keys that contain A°

Scales to play over A°

Ordered from the most common choice. All of them contain A, C, E♭.

Other A chords

Triads

Sevenths

Sixths

Added

Extended

Diminished chords in other keys

FAQ

What notes are in the A° chord?
A° (A diminished) contains A, C, E♭ — formula 1 ♭3 ♭5.
How do you play A° on guitar?
A common shape is x0121x (low E to high E, x = muted string, open position). This page shows more shapes, drop 2, drop 3 and shell voicings in the interactive library.
What scale goes with A°?
Good choices to solo over A°: A Locrian, A Diminished (whole-half), A Blues.
What key is A° in?
A° is diatonic in B♭ major (vii°), G minor (ii°).