B♭dim7 guitar chord
How to play B♭dim7 on guitar — the notes B♭, D♭, F♭, A𝄫, a shape you can tap to hear, the keys it lives in, and a progression to hear it in context. Free.
The shape
Tap the diagram to hear B♭dim7 strummed. B♭dim7 is played as a barre chord around fret 1: lay a finger across the strings at that fret and build the shape on top. Movable, so the same grip works up and down the neck.
The notes in B♭dim7
A diminished seventh chord is spelled from its root up: B♭ (R), D♭ (♭3), F♭ (♭5), A𝄫 (♭♭7). Those are the only notes in B♭dim7 — play them in any order, in any octave, and it's still B♭dim7.
What a diminished seventh chord is
In plain terms, a diminished 7th stacks three minor thirds (root, ♭3, ♭5, ♭♭7) — perfectly symmetrical, so it can pivot to almost any key.
How it's used: A slippery passing chord: because every note is a minor third apart, one shape covers four different roots, and it can lead almost anywhere.
The sound: Maximum tension, mysterious, cinematic — the classic 'something's coming' chord. Where you'll hear it: Jazz passing chords, silent-film suspense, neoclassical metal, gypsy jazz.
Other B♭ chords
diminished seventh chords on other roots
Chords and their spellings are shared facts of music theory. Every diagram and sound here is generated by ThunderFret's own engine — no tabs, lyrics or recordings are reproduced.
Open B♭dim7 in the interactive tool to see every place it sits on the neck, hear it, and find the shape that fits your hand — free.
See B♭dim7 on the fretboardFrequently asked
What notes are in B♭dim7?
B♭dim7 is made of 4 notes: B♭ (the R), D♭ (the ♭3), F♭ (the ♭5), A𝄫 (the ♭♭7).
How do you play B♭dim7 on guitar?
B♭dim7 is played as a barre chord around fret 1: lay a finger across the strings at that fret and build the shape on top. Movable, so the same grip works up and down the neck.
When would I use B♭dim7?
Jazz passing chords, silent-film suspense, neoclassical metal, gypsy jazz.