Bb Diminished 7 Piano Chord
The Bb Diminished 7 chord contains the notes Bb, Db, Fb, Abb, built from the intervals 1 – b3 – b5 – bb7.
Chord formula
1 – b3 – b5 – bb7
Active voicing: Bb – Db – Fb – Abb
Default voicing. Notes Bb, Db, Fb, Abb.A# dim7
- Notes
- Bb, Db, Fb, Abb
- Intervals
- 1, b3, b5, bb7
- Also known as
- A#dim7, A#°7
Chord inversions
- CDFbFAbbABCDFbFAbbABBbDb
- CDFbFAbbABCDFbFAbbABDbBb
- CDFbFAbbABCDFbFAbbABBb
- CDFbFAbbABCDFbFAbbABBb
Practice Chords in Bb
Related chords
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How it is built
Bb diminished 7 stacks three minor thirds on top of each other, making it a fully symmetrical chord — every note is a minor third above the last, including the double-flat seventh back to the root.
Common musical function
Because of its symmetry, a diminished 7 chord can resolve in several different directions and is a favorite tool for modulating between keys or adding dramatic tension before resolving by a half step.
Beginner practice advice
Practice Bb in root position until the shape feels automatic, then work through the first, second, and third inversions. Use the audio button to check your voicing, and drill short changes to neighboring chords in the same key.
Moving into and out of the chord
Look for shared notes with nearby chords in the key — keeping a finger on a common tone makes changes smoother. Bb diminished and Bb minor 7 flat 5 are good starting points for short practice loops — see the full related chords list below for more.
FAQ
- What notes are in a Bb Diminished 7 chord?
- A Bb Diminished 7 piano chord uses the notes Bb, Db, Fb, Abb.
- How do I practice Bb on piano?
- Start in root position, then work through the inversions, listen with the audio button, and practice short changes to related chords in the same key.
- Can I explore Bb in every key?
- Yes. Open the Interactive Chord Explorer to transpose this chord quality across all twelve roots, or use Practice Mode to drill changes in time.
Ready to practice Bb Diminished 7 Piano Chord?
Use Go Practice to drill chord changes with a metronome and build muscle memory in this key.