x 1 3 1 3 1
A#7
Notes: A# · C## · E# · G#
More common: Bb7
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 A#7
A#7 is built from four notes: A# (root), C## (major third), E# (perfect fifth) and G# (minor seventh). In scale degrees above the root, the 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, A#7 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. There are 34 more voicings sorted by difficulty; use the viewer switches to add inversions and stretches. A#7 is also written as Bb7: the same chord with the root spelled differently, and it sounds identical. The more common spelling is Bb7.