Ukulele · diminished seventh
B♭dim7 Chord on Ukulele
Bb Diminished 7th is Bb, Db, Fb, G — the 1-b3-b5-bb7 pattern of a diminished seventh chord. Here is the shape, the audio, and what usually goes wrong.
Good news: Bbdim7 has an open shape on ukulele, so you can play it without barring anything. Start there and work up the neck later.
Start here — Movable Dim7 Shape (1st fret)
Open shape — open strings ring right through it and there is nothing to barre. If you only learn one, learn this one.
What beginners get wrong
Moving in and out of it
The shape above: Movable Dim7 Shape (1st fret) — open position, so several strings ring unfretted — barred at fret 1.
Listening: each shape above has its own play button, and each one plays the notes that shape actually produces — not a generic triad.
Bbdim7 on other instruments
Same notes, different hands. Every link below is a real page with diagrams and audio.
Chords next door
Same root, different colour — and all of them playable on ukulele.
Bbdim7 on Ukulele — questions people ask
What is the easiest way to play Bbdim7 on ukulele?
“Movable Dim7 Shape (1st fret)” — which we rate intermediate — is the easiest Bbdim7 shape on ukulele. Open shape — open strings ring right through it and there is nothing to barre. If you only learn one, learn this one.
What notes are in the Bb Diminished 7th chord?
Bb Diminished 7th is Bb, Db, Fb, G — the 1-b3-b5-bb7 interval pattern of a diminished seventh chord. Every voicing on this page uses those notes and nothing else; they just appear in a different order and octave.
What can I play instead of Bbdim7?
The nearest stand-ins on ukulele that keep the same root are Bbsus4, Bbsus2, Bb. They keep the root and the fifth and only change what sits in the middle, so most songs still work — but check the swap against the melody, because the note you removed may be the one the tune is singing.
Can I play Bbdim7 on other instruments?
Yes. Bbdim7 is the same set of notes everywhere; only the fingering changes. This site has diagrams and audio for it on guitar, piano, bass, mandolin, banjo.
Learn the theory behind Bbdim7
The shape gets your fingers there. These explain why it sounds the way it does.
Barre Chords — The Wall Every Guitarist Climbs
This one asks for a barre. The article is the fix for the buzzing and the aching hand.
7 min read
Functional Harmony: Three Roles, One Engine
Diminished chords are almost always doing a job. This explains which one.
6 min read
Cadences — The Four Ways a Phrase Ends
Where all that tension goes — how the chord resolves into the next one.
4 min read