x 1 3 1 3 1
Bb7
Notes: Bb · D · F · Ab
Also spelled A#7
Triads
Suspended
Sevenths
Extensions
Common shapes (4)
6 5 3 3 3 4
6 8 6 7 6 6
x x 8 10 9 10
Other shapes (34)
Showing 12 of 34
x 1 0 1 3 x
x 1 0 1 x 1
x 1 0 1 3 1
x 1 0 1 3 4
x 1 0 3 3 4
x 1 3 1 3 x
6 5 6 7 x x
6 5 6 3 x x
6 5 0 x 6 4
6 8 6 7 x x
6 8 0 7 9 x
6 5 6 x 6 x
About Bb7
The Bb7 chord is made up of Bb (root), D (major third), F (perfect fifth) and Ab (minor seventh). Its interval formula is 1 – 3 – 5 – b7. The minor seventh adds a tension that asks to resolve, which is why it is the typical chord on the fifth degree of a key.
On guitar, Bb7 has 4 common shapes: the A, G, E and D shapes. These are CAGED system shapes, the basis for playing the same chord anywhere on the neck. The viewer also shows 34 more voicings, from easiest to hardest. Bb7 is also written as A#7: the same chord with the root spelled differently, and it sounds identical. The more common spelling is Bb7.