A# Augmented Seventh Guitar Arpeggio
Guitar arpeggio in Open G tuning — fretboard diagram
A# Augmented Seventh in Open G — Notes and Intervals
Notes: A#, D, E##, A
Intervals: 1P, 3M, 5A, 7M
Formula: 2W-2W-WH
Number of notes: 4
Tuning: Open G (D-G-D-G-B-D)
Also known as: maj7#5, maj7+5, +maj7, ^7#5
The A# Augmented Seventh arpeggio contains 4 notes (A#, D, E##, A). Use the interactive fretboard above to explore this arpeggio on 6-string guitar — Open G with different tunings and fret ranges.
About Open G Tuning
Open G tuning (D-G-D-G-B-D) produces a G major chord when strummed open, making it the definitive tuning for slide guitar and delta blues. The tuning's natural consonance means that barring across any fret gives you a major chord, which is why it's been the backbone of blues and roots music for over a century.
From Robert Johnson to Keith Richards, Open G has shaped some of the most iconic music ever recorded. Keith Richards famously removes the low 6th string entirely in this tuning, creating his signature five-string sound on songs like 'Start Me Up' and 'Brown Sugar'. For slide players, Open G is essential — it allows clean, singing slide lines across all strings with minimal effort.
Notable artists: Keith Richards, Robert Johnson, Ry Cooder, Joni Mitchell, The Black Crowes
Best for: Slide guitar, delta blues, Keith Richards-style rock riffs, and open-string fingerpicking