A Sharp Seventh / B Flat Seventh

Every seventh chord is made up of the 1st, 3rd, 5th and b7th notes of the major scale

Choose a chord below to see an example (with chord diagrams)

C

C# Db

D

D# Eb

E

F

F# Gb

G

G# Ab

A

A# Bb

B

The A# / Bb major scale is

A#	C	D	D#	F	G	A
1	2	3	4	5	6	7

To make an “A sharp seventh” (A#7) or “B flat seventh” (Bb7) chord we use

the 1^st note A#

the 3^rd note D

the 5^th note F

the b7^th (half step lower from the 7^th) note G#

This gives us the notes A#, D, F and G# which form the

“A sharp seventh” or “B flat seventh” chord 

“A sharp seventh” (A#7) 

or 

“B flat seventh” (Bb7) on the guitar

“A sharp seventh” (A#7) 

or 

“B flat seventh” (Bb7) on the piano