Voicings · A♯°7 · Guitar
A♯°7 is spelled A♯ – C♯ – E – G (1 ♭3 ♭5 ?) — passing chords between diatonic chords, and as a 7♭9 without its root. Here are 3 ways to voice it on guitar: drop 2, drop 3, shell. Every diagram is playable — press play to hear the chord, or “roll it” to hear the voices one by one, low to high.
The voicings
Take the close voicing and drop its second-highest voice an octave. The most-used four-note voicing on guitar and in piano left hands. Strings D-G-B-e, frets 2-3-2-3.
Drop the third-highest voice of the close voicing an octave: a wide, open sound. Strings A-G-B-e, frets 4-3-5-3 (position 1).
Root, seventh and third only. The fifth is dropped — it adds nothing to the chord's identity — leaving a light, clear voicing. Strings E-D-G, frets 6-5-6 (position 2).
Reference
| Chord tone | Note | Interval |
|---|---|---|
| 1 | A♯ | unison |
| ♭3 | C♯ | minor 3rd |
| ♭5 | E | tritone |
| ? | G | major 6th |
Arpeggio: A♯°7 arpeggio on guitar. Scale: B♭ Diminished (whole–half).
Common questions
A♯, C♯, E, G — chord tones 1 ♭3 ♭5 ?.
The shell voicing (root, seventh, third) on strings E, D, G: three notes, one comfortable shape, and it still sounds unmistakably like A♯°7.
Start from the close voicing A♯ C♯ E G and drop the second note from the top an octave: E – A♯ – C♯ – G. It spreads the chord so it fits the hand — and on guitar it fits four adjacent strings.
A♯°7 is passing chords between diatonic chords, and as a 7♭9 without its root. Its character is symmetrical, restless.
Keep going
Same chord on piano · Diminished 7th hub.
Other chords from A♯