The Bb7 / A#7 chord (Bb7) is made of the notes Bb, D, F and Ab. It is built from the root Bb with a major third, a perfect fifth and a minor seventh.
The dominant seventh chord creates a tension that wants to resolve to the chord a fourth higher; it is everywhere in blues, jazz and rock.
Bb7
Notes: Bb – D – F – Ab
Guitar — positions on the neck
Piano — root position and inversions
Fingerings and positions
On guitar, this chord can be played in 5 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): x13131. On piano, the right hand plays 4 notes, in root position or in an inversion.
Notes and intervals
Note
Interval
Bb
root
D
major third
F
perfect fifth
Ab
minor seventh
In which keys? The Bb7 chord is the V7 of Eb major and the VII7 of C minor.
The notes of the Bb7 chord (Bb7) are Bb, D, F and Ab.
How do you play the Bb7 chord on guitar?
On guitar, this chord can be played in 5 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): x13131.
How is the Bb7 chord built?
The Bb7 / A#7 chord (Bb7) is made of the notes Bb, D, F and Ab. It is built from the root Bb with a major third, a perfect fifth and a minor seventh.
Are Bb and A# the same chord?
Yes: Bb and A# are the same note (they are called enharmonic), so Bb7 / A#7 is played exactly the same way, with the same fingerings.