The Bb diminished / A# diminished chord (Bbdim) is made of the notes Bb, Db and Fb. It is built from the root Bb with a minor third and a diminished fifth.
The diminished chord is unstable and tense: it is mostly used as a passing chord between two other chords.
Bb diminished
Notes: Bb – Db – Fb
Guitar — positions on the neck
Piano — root position and inversions
Fingerings and positions
On guitar, this chord can be played in 4 ways along the neck. It is most often played with a barre. Example fingering (from the low E string to the high E string, x = muted string): x1232x. On piano, the right hand plays 3 notes, in root position or in an inversion.
Notes and intervals
Note
Interval
Bb
root
Db
minor third
Fb
diminished fifth
In which keys? The Bb diminished chord is the vii° of B major and the ii° of Ab minor.
The notes of the Bb diminished chord (Bbdim) are Bb, Db and Fb.
How do you play the Bb diminished chord on guitar?
On guitar, this chord can be played in 4 ways along the neck. It is most often played with a barre. Example fingering (from the low E string to the high E string, x = muted string): x1232x.
How is the Bb diminished chord built?
The Bb diminished / A# diminished chord (Bbdim) is made of the notes Bb, Db and Fb. It is built from the root Bb with a minor third and a diminished fifth.
Are Bb and A# the same chord?
Yes: Bb and A# are the same note (they are called enharmonic), so Bb diminished / A# diminished is played exactly the same way, with the same fingerings.