How to play A#7b5: a dominant 7th flat 5 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 2 1 3 x (x = not played).
| Note | A# | Cx | E | G# |
|---|---|---|---|---|
| Interval | R | 3 | b5 | b7 |
A#7b5 is a dominant 7th flat 5 with A# as its root. The full theoretical spelling is A#, Cx, E, G#. This voicing sounds every chord tone.
A#7b5 is not a diatonic chord in any major or minor key: it turns up as a borrowed chord, a passing chord or an altered dominant, which is part of its color.
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A#7b5 is spelled A#, Cx, E, G#: the root, 3rd, flat 5th, flat 7th. The common guitar voicing sounds every one of them.
Frets from the low E string to the high E string: x 1 2 1 3 x (x means the string is not played). Lay your index finger across the 1st fret from the A string to the G string (a barre). Add the D string at the 2nd fret. Add the B string at the 3rd fret. Strum from the A string down, skipping the high E string; the low E string stays silent.
A#7b5 is not a diatonic chord in any major or minor key: it turns up as a borrowed chord, a passing chord or an altered dominant, which is part of its color.
