How to play A#m7b5: a half-diminished (m7b5) 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 2 x (x = not played).
| Note | A# | C# | E | G# |
|---|---|---|---|---|
| Interval | R | b3 | b5 | b7 |
A#m7b5 is a half-diminished (m7b5) with A# as its root. The full theoretical spelling is A#, C#, E, G#. This voicing sounds every chord tone.
A#m7b5 is a diatonic chord (built from the key's own notes) in 1 major key and 2 minor keys. The roman numeral is the chord's place in that key; tap a key for all of its chords.
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A#m7b5 is spelled A#, C#, E, G#: the root, minor 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 2 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 and B strings at the 2nd fret. Strum from the A string down, skipping the high E string; the low E string stays silent.
A#m7b5 belongs to 3 keys: B major (the viiø chord), G# minor (the iiø) and F minor (the ivø, from the harmonic minor).
