A Diminished 7th
Adim7 is made of 4 notes: A, C, Eb and Gb. Here it is in root position, with A at the bottom.
Inside Notley Piano: all the inversions of Adim7, fingering for both hands, a play button, and practice that helps you remember it.
| Note | Degree | Interval from A |
|---|---|---|
| A | 1 | root |
| C | b3 | minor 3rd |
| Eb | b5 | diminished 5th |
| Gb | bb7 | diminished 7th |
A diminished 7th chord stacks three minor 3rds. It sounds dramatic and spooky, and every note is the same distance apart, so the same shape repeats every three frets.