How to play A#7b9: a dominant 7th flat 9 built on A#, with 1 voicing, the notes, the keys it belongs to, and songs that use it.
The first diagram is a common voicing: played at the first few frets. An X above a string means don't play it; an O means play it open.
Frets from the low E string to the high E string: x 1 x 4 3 4 (x = not played).
| Note | A# | Cx | G# | B |
|---|---|---|---|---|
| Interval | R | 3 | b7 | b9 |
A#7b9 is a dominant 7th flat 9 with A# as its root. The full theoretical spelling is A#, Cx, E#, G#, B. This voicing omits the 5th, the tone guitarists drop first when fitting a chord onto six strings.
A#7b9 is a diatonic chord (built from the key's own notes) in 0 major keys and 1 minor key. The roman numeral is the chord's place in that key; tap a key for all of its chords.
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A#7b9 is spelled A#, Cx, E#, G#, B: the root, 3rd, 5th, flat 7th, flat 9th. The common guitar voicing sounds A#, Cx, G#, B, leaving out the 5th.
Frets from the low E string to the high E string: x 1 x 4 3 4 (x means the string is not played). Fret the A string at the 1st fret. Add the B string at the 3rd fret. Add the G and high E strings at the 4th fret. Strum from the A string down, skipping the D string; the low E string stays silent.
A#7b9 belongs to one key: D# minor (the V, from the harmonic minor).
