B Flat Dominant 7th (also written A#7)
Bb7 is made of 4 notes: Bb, D, F and Ab. Here it is in root position, with Bb at the bottom.
Inside Notley Piano: all the inversions of Bb7, fingering for both hands, a play button, and practice that helps you remember it.
| Note | Degree | Interval from Bb |
|---|---|---|
| Bb | 1 | root |
| D | 3 | major 3rd |
| F | 5 | perfect 5th |
| Ab | b7 | minor 7th |
A dominant 7th chord adds a minor 7th on top of a major chord. It sounds bluesy and restless, and it pulls strongly back to the chord a 5th below. It is the backbone of the 12-bar blues.