Bbdim chord

The Bbdim chord (Bb diminished, also written A#dim) on a piano: the notes, every inversion and the keys it belongs to. Tap play to hear it, and download it as MIDI.

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Bb1Dbb3Fb= Eb5

About the diminished chord

The root, a minor third and a diminished fifth. Tense and unstable, mostly used as a passing chord.

Formula: 1 b3 b5. Used in: Film music, classical, jazz, and as a step between two chords.

Bbdim inversions

Tap an inversion to hear it. Inversions keep the same notes in a different order, which lets chords move smoothly from one to the next.

Keys with Bbdim

Bbdim is the VII chord in B major and II chord in G# minor.

It also appears in C# Dorian (VI), D# Phrygian (V), E Lydian (IV), F# Mixolydian (III).

Build a progression around it in the chord progression generator.

More Bb chords

Other diminished chords

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Questions

What notes are in a Bbdim chord?

Bb, Db, Fb (E).

What is the formula of a diminished chord?

1 b3 b5. The root, a minor third and a diminished fifth. Tense and unstable, mostly used as a passing chord.

What key is Bbdim in?

Bbdim is a chord in B major (VII), G# minor (II).

Is Bbdim the same as A#dim?

Yes. Bb and A# are the same key on the piano, so the chords sound the same. Which name is used depends on the key of the song.