What is Open A tuning?

Open A tuning is E-A-E-A-C#-E (low to high). Strumming all strings produces an A major chord. It's structurally the same as Open G but one whole step higher.

Is Open A the same as Open G with a capo?

Yes, musically they are identical — Open G with a capo at fret 2 gives you the same pitches as Open A. Many players use this approach. Without a capo, Open A has higher string tension which some slide players prefer for better control.

What scales work in Open A?

The A major pentatonic and A blues scale are natural choices. A Mixolydian gives a bluesy feel, and the A major scale works for country and folk styles.

A# Messiaen's Mode #3 Guitar Scale

Guitar scale in Open A tuning — fretboard diagram

Tuning

Frets

A# Messiaen's Mode #3 in Open A — Notes and Intervals

The A# Messiaen's Mode #3 scale is a complex nine-note symmetrical scale used by Olivier Messiaen. On Guitar, its notes are A#, C, C#, D, E, F, F#, G#, A. It creates a cosmic, suspended tonality that feels both religious and scientific, evoking a sense of divine awe. Commonly used in Contemporary Classical, Film Scores, Ambient, Experimental. Notable players include Olivier Messiaen, Gyorgy Ligeti, Thomas Ades. Use for creating atmospheres of 'cosmic awe'. Not bound to traditional chord progressions — works best over sustained harmonies or ostinato patterns.

Notes: A#, C, C#, D, E, F, F#, G#, A

Intervals: 1P, 2M, 3m, 3M, 4A, 5P, 6m, 7m, 7M

Degrees: 1 2 b3 4 #5 6 b7 b8 9

Formula: W-H-H-W-H-H-W-H-H

Number of notes: 9

Tuning: Open A (E-A-E-A-C#-E)

About Open A Tuning

Open A tuning (E-A-E-A-C#-E) produces an A major chord when strummed open. It is structurally identical to Open G tuned up one whole step, delivering a brighter, more tense sound that works particularly well for slide guitar centered on the key of A.

Jimmy Page used Open A with a slide on Led Zeppelin's 'In My Time of Dying' from Physical Graffiti (1975). Rory Gallagher also employed Open A for his raw, energetic slide work. Many players achieve Open A by simply placing a capo at the 2nd fret in Open G tuning, which is why dedicated Open A usage is less commonly discussed. However, without a capo, Open A gives direct access to the open A string resonance and a different feel under the fingers due to the higher tension.

BluesSlide GuitarRockDelta Blues

Notable artists: Jimmy Page, Rory Gallagher, Delta blues players

Best for: Slide guitar in the key of A, blues playing, and situations where you need the brightness of Open G tuned up without a capo

Musical Character

CosmicSuspendedDivineCrystalline

A 9-note scale with limited transposition — only 4 unique transpositions exist before repeating. Creates a cosmic, suspended tonality that is neither major nor minor but something transcendent.

Explore This Scale in Other Tunings

← All Guitar scales in Open A tuning