A# / Bb Diminished 7 (A#dim7)
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E
A
D
G
B
E
1
2
3
4
1
2
3
4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
maj
min
sus 2
sus 4
7
maj 7
min 7
min maj 7
7 sus 4
7 aug 5
7 aug 9
7 dim 5
7 dim 9
6
min 6
6 9
9
min 9
maj 9
9 dim 5
aug
dim
dim 5
dim 7
11
13
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The A# diminished 7 (A#dim7) chord is a chord having a root (A#), minor third (C#), diminished fifth (E) and a major six (G). An diminished seventh chord is a minor chord where the perfect fifth has been lowered one semitone, plus an lowered minor seventh (also called a major sixth).
