To play A#7b5 on the ukulele, you need the notes A#, D, E, G#. Its first ukulele voicing is the open position: G string at fret 1 (index finger); C string at fret 2 (ring finger); E string open; A string at fret 1 (middle finger). This guide covers the 7th flat 5th chord in full: what is in it, how to play it cleanly on the ukulele, where it fits musically and how to practise it.
What notes are in the A#7b5 chord?
The A#7b5 chord is a 7th flat 5th chord, and its notes are fixed: A#, D, E, G#. Every voicing on every instrument uses these same notes, in some order and in some octave — change one of them and you are playing a different chord. The table below lists each note with its interval from the root A#, so you can see the structure of A#7b5 at a glance. On the ukulele, the open position voicing is the place to hear it in A#7b5.
| Note | Interval |
|---|---|
| A# | Root |
| D | 3 |
| E | b5 |
| G# | b7 |
The root is A#, the note the chord is named after and the note your ear hears as home. Above it, the intervals in A#7b5 are 3, b5, b7. Learn those intervals rather than memorising the shape alone, because the same interval pattern transposed to another root gives you the same quality of chord anywhere. On the ukulele, the notes appear in the order the fingering dictates, but the set of notes never changes.
A#7b5 sounds tense, dark and jazzy — the flattened 5th ({flat5}) gives the dominant chord a chromatic edge. The colour is strongest when all the notes ring clearly. A muted chord tone, especially the 3rd or the 7th where the chord has one, flattens the character of A#7b5 noticeably. On the ukulele, the open position voicing is the place to hear it in A#7b5.
Comparing A#7b5 with its closest relatives helps to fix it in your ear. In short, 7b5 against dominant 7th: A#7b5 flattens the 5th to E where the plain dominant 7th keeps the perfect 5th F. That one change adds a whole new layer of tension. Hearing the comparison matters more than reading it: play A#7b5, then play the chord it is compared with above, and let your ear find the note that changed. On the ukulele, the open position of A#7b5 puts those notes under your fingers in the order the fingering lists them.
How to play A#7b5 on ukulele
On the ukulele, A#7b5 has 3 voicings in the data below, and each one uses the same notes — A#, D, E, G# — in a different place on the neck. Start with the first voicing and get it clean before you try the movable shapes further up the neck. Finger numbers below use 1 for the index finger, 2 for the middle finger, 3 for the ring finger and 4 for the little finger, and x means the string is not played.
The open position puts A#7b5 in open position: G string at fret 1 (index finger); C string at fret 2 (ring finger); E string open; A string at fret 1 (middle finger). This voicing is comfortable because the fretted notes sit close together, from fret 1 to fret 2, so your hand stays relaxed and every note can ring. Strum or pluck it slowly first and check that every note in A#7b5 — A#, D, E, G# — sounds, with no buzz and no accidental open string.
The movable voicing is the voicing to learn if you want A#7b5 in around fret 3: G string at fret 3 (index finger); C string at fret 4 (middle finger); E string at fret 4 (middle finger); A string at fret 5 (ring finger). This voicing is comfortable because the fretted notes sit close together, from fret 3 to fret 5, so your hand stays relaxed and every note can ring. Strum or pluck it slowly first and check that every note in A#7b5 — A#, D, E, G# — sounds, with no buzz and no accidental open string.
The movable voicing puts A#7b5 in around fret 6: G string at fret 7 (middle finger); C string at fret 8 (little finger); E string at fret 6 (index finger); A string at fret 7 (ring finger). This voicing is comfortable because the fretted notes sit close together, from fret 6 to fret 8, so your hand stays relaxed and every note can ring. Strum or pluck it slowly first and check that every note in A#7b5 — A#, D, E, G# — sounds, with no buzz and no accidental open string.
Choosing between the voicings of A#7b5 is a musical decision, not a right-or-wrong one. The open or low-position voicing rings the most and suits strumming, while a barre or movable voicing lets you slide A#7b5 up the neck to any key without changing the shape. When you change chords, pick the voicing of A#7b5 that sits closest to the chord before it — shorter moves between shapes mean faster, cleaner changes. Practise the change into A#7b5 from the chord that comes before it in your song, not the chord on its own, because the move is the skill. On the ukulele, start with the first voicing above and listen for the notes A#, D, E, G# in A#7b5.
A short practice routine for A#7b5 on the ukulele: play the first voicing four times slowly, checking each note, then change to it from the chord a fourth above A# and back, four times, at a slow tempo. Then play the second voicing the same way. If a note buzzes, stop and fix the finger placement rather than playing through the buzz — clean notes at a slow tempo become clean notes at full tempo, while buzzes practised fast become habits. Use the Ukulele Chord Finder to see the diagram for A#7b5 while you practise, and the Chord Finder to compare it with the same chord on other instruments.
Common mistakes
These are the mistakes that most often make A#7b5 sound wrong on the ukulele, and each one has a concrete fix. Work through them one at a time rather than trying to fix everything at once.
Pressing too hard on the nylon strings. Ukulele strings need far less pressure than guitar strings, and pressing hard on A#7b5 pulls the notes sharp and tires the hand. Use the lightest touch that gives a clean note, and keep your fingers close to the frets. On the ukulele, the open position of A#7b5 puts those notes under your fingers in the order the fingering lists them.
Playing a perfect 5th. If the 5th is F the chord is a plain dominant 7th. The flattened 5th E is the note that makes it altered. On the ukulele, the open position of A#7b5 puts those notes under your fingers in the order the fingering lists them.
Using it as a tonic. A#7b5 is a dominant chord, and an altered one at that. It wants to resolve, usually to the tonic a fourth above its root. On the ukulele, the open position of A#7b5 puts those notes under your fingers in the order the fingering lists them.
Voicing it too low. The flattened 5th low down can sound muddy against the root. Keep E in a higher octave. On the ukulele, the open position of A#7b5 puts those notes under your fingers in the order the fingering lists them.
Where A#7b5 is used
A#7b5 is not a diatonic triad in any major or minor key, because it is an extended or altered chord, but its base triad belongs to the key of D# major, the key of F major, the key of A# major. an altered dominant in jazz, where the flattened 5th adds tension before a resolution. As a dominant-type chord it also points toward D# major, the key a perfect fourth above A#, which is the tonic it most often resolves to. That is where A#7b5 does its work: not as a home chord, but as a chord that creates movement and then resolves. On the ukulele, the open position voicing is the place to hear it in A#7b5.
Because A#7b5 is an extended or altered chord, it appears in progressions as a colour or a dominant rather than as a diatonic staple. Try it in place of the plain A# triad in a progression you already know, and listen to how the extra notes change the feel — that substitution is the usual way extended chords enter real music. The Chord Progression Builder lets you try A#7b5 in a progression in any key and hear how it connects to the chords around it. On the ukulele, start with the first voicing above and listen for the notes A#, D, E, G# in A#7b5.
The same chord on other instruments is covered in A#7b5 on guitar, A#7b5 on piano, A#7b5 on bass, and the scales that fit over it are the A# major scale and the A# minor pentatonic scale. Learning A#7b5 on the ukulele and then checking it on another instrument is one of the best ways to fix the notes — A#, D, E, G# — in your memory, because the notes stay the same while everything else changes.
Practising A#7b5
A short worked example makes A#7b5 concrete. Play the four-chord progression D# – A# – Cm – G# in D# major, the key A#7b5 most often resolves toward: D# – A# – Cm – G#. Play each chord for one bar at a slow tempo, and listen to how A#7b5 sounds in that sequence — whether it feels like home, like a lift, or like a chord on its way somewhere else. Then play the same four chords in a different order, starting on A#7b5 itself, and notice how its character changes when it opens the progression instead of sitting inside it. On the ukulele, the open position of A#7b5 puts those notes under your fingers in the order the fingering lists them.
For a second exercise, play A#7b5 and then the chord a fourth above A#, back and forth, four times each. That move — a chord and the chord a fourth above it — is the most common resolution in Western music, and it is the move A#7b5 is built for when it acts as a dominant. Finish by playing A#7b5 on its own, slowly, and naming each note out loud as you play it: A#, D, E, G#. Naming the notes while you play them is what turns a shape into knowledge you can use in any key. Test yourself with the Practice Chord Quiz and keep time with the Metronome as the tempo rises. On the ukulele, the open position voicing is the place to hear it in A#7b5.
Frequently asked questions
Is A#7b5 hard to play on the ukulele?
It depends on the voicing. The first voicing of A#7b5 on the ukulele is the easiest starting point, and the movable voicings further up the neck are harder because they need a barre or a wider stretch. Practise the first voicing cleanly at a slow tempo before you try the others, and the harder shapes will come more easily.
What is the easiest voicing of A#7b5 on the ukulele?
The open position is the easiest voicing listed for A#7b5 on the ukulele: frets 1–2–0–1, fingers 1–3–0–2. Learn that shape first, get every note ringing cleanly, and only then move on to the alternative voicings further up the neck.
What notes are in A#7b5?
A#7b5 contains A#, D, E, G#: root A#, major 3rd D, flattened 5th E and flattened 7th G#. The flattened 5th is the note that makes it an altered dominant. On the ukulele, the first voicing above shows where that note sits.
What is the difference between A#7b5 and A#7?
A#7 has the perfect 5th F; A#7b5 flattens it to E. A#7b5 sounds tenser and more chromatic, and it is used as an altered dominant in jazz. On the ukulele, the first voicing above shows where that note sits.
Where is A#7b5 used?
A#7b5 is an altered V chord in jazz, used before a resolution to the tonic, and as a tritone substitute for the dominant a tritone away. On the ukulele, the first voicing above shows where that note sits.