A♯dim7, diminished seventh chord
A♯, C♯, E and G
- Root
- A♯
- Minor third
- C♯
- Diminished fifth
- E
- Diminished seventh
- G
Formula
1 ♭3 ♭5 𝄫7 (3, 6, 9 half steps above A♯)
Fingering in root position
| Notes | A♯ | C♯ | E | G |
|---|---|---|---|---|
| Right hand | 1 | 2 | 3 | 5 |
| Left hand | 5 | 3 | 2 | 1 |
A♯ diminished 7 inversions
A♯ diminished 7 has 3 inversions. Each one keeps the same notes and puts a different one at the bottom, so your hand can stay close to the chord before or after it.
A♯dim7
Root position
| Notes | A♯ | C♯ | E | G |
|---|---|---|---|---|
| Right hand | 1 | 2 | 3 | 5 |
| Left hand | 5 | 3 | 2 | 1 |
A♯dim7/C♯
First inversion
| Notes | C♯ | E | G | A♯ |
|---|---|---|---|---|
| Right hand | 1 | 2 | 3 | 5 |
| Left hand | 5 | 3 | 2 | 1 |
A♯dim7/E
Second inversion
| Notes | E | G | A♯ | C♯ |
|---|---|---|---|---|
| Right hand | 1 | 2 | 3 | 5 |
| Left hand | 5 | 3 | 2 | 1 |
A♯dim7/G
Third inversion
| Notes | G | A♯ | C♯ | E |
|---|---|---|---|---|
| Right hand | 1 | 2 | 3 | 5 |
| Left hand | 5 | 3 | 2 | 1 |
Keys with A♯ diminished 7
Roman numerals give a chord's place in a key: capitals for major chords, small letters for minor, ° for diminished. A♯ diminished 7 appears as:
- vii°7 in B minor
How A♯ diminished 7 is built
A♯ is the root, C♯ the minor third, E the diminished fifth and G the diminished seventh.
A diminished seventh chord stacks three minor thirds, so every note is 3 half steps from the next. That symmetry means A♯ diminished 7 uses the same four keys as C♯ diminished 7, E diminished 7 and G diminished 7.
Every chord takes every other letter of the alphabet, so the letters of A♯ diminished 7 are A, C, E, G. That is why it is spelled A♯, C♯, E and G.
Find A♯ diminished 7 yourself
Without looking at the diagrams, find the chord on the keyboard, then each inversion. Saying the notes out loud as you tap them helps them stick.
Step 1 of 4
Tap the notes of A♯ diminished 7, in any octave and any order.
Practice A♯ diminished 7 in real music
MasterPiano gives you new music to read at your level and listens as you play, through a MIDI keyboard or your device's microphone, marking each note right or wrong.
Start freeQuestions
What notes are in the A♯ diminished 7 chord?
A♯ diminished 7 (A♯dim7) has four notes: A♯, C♯, E and G. A♯ is the root, C♯ the minor third, E the diminished fifth and G the diminished seventh.
What fingers do you use for A♯ diminished 7 on piano?
In root position, play A♯, C♯, E and G with right hand fingers 1, 2, 3 and 5 (thumb, index finger, middle finger and little finger) and left hand fingers 5, 3, 2 and 1. The fingers change a little in each inversion; every inversion on this page shows its own.
What are the inversions of A♯ diminished 7?
A♯ diminished 7 has 3 inversions, one for each note other than the root at the bottom. First inversion (A♯dim7/C♯): C♯, E, G and A♯. Second inversion (A♯dim7/E): E, G, A♯ and C♯. Third inversion (A♯dim7/G): G, A♯, C♯ and E.
What key is A♯ diminished 7 in?
A♯ diminished 7 appears as vii°7 in B minor.