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.

C# Messiaen's Mode #4 Guitar Scale

Guitar scale in Open A tuning — fretboard diagram

Tuning

Frets

C# Messiaen's Mode #4 in Open A — Notes and Intervals

The C# Messiaen's Mode #4 scale is a symmetrical scale designed to have no single tonic. On Guitar, the notes are C#, D, D#, F#, G, G#, A, C. Messiaen used it to create what he called the charm of impossibilities, evoking a sense of spiritual wonder where the listener loses their sense of direction. Commonly used in Contemporary Classical, Film Scores, Experimental. Notable players include Olivier Messiaen. Use for avant-garde composition and film scoring where traditional tonal direction should dissolve.

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

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

Degrees: 1 b2 3 4 #5 6 b7 8

Formula: H-H-WH-H-H-H-WH-H

Number of notes: 8

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

DirectionlessSpiritualWanderingAwe

Creates what Messiaen called 'the charm of impossibilities' — the listener loses their sense of tonal direction, creating a spiritual disorientation that evokes wonder.

Explore This Scale in Other Tunings

← All Guitar scales in Open A tuning