B flat seventh guitar chord (Bb7)
Also written A#7 (A sharp seventh)
The seventh chord (dominant seventh) adds a minor seventh to the major chord. It creates tension that wants to resolve: essential in blues, jazz and rock’n’roll.
Positions and fingerings
Position 1 fret 1
Position 2 fret 6
Position 3 fret 8
× muted string · o open string · numbers: fingers (1 index, 2 middle, 3 ring, 4 pinky)
Chord notes
| Note | Interval |
|---|---|
| B♭ (B flat) | root |
| D | major third |
| F | perfect fifth |
| A♭ (A flat) | minor seventh |
Formula: 1 – 3 – 5 – b7 · B♭ – D – F – A♭
A progression with this chord
The ii – V – I: the seventh chord (V7) builds tension that resolves to the tonic chord (I).