A Diminished
Adim is made of 3 notes: A, C and Eb. Here it is in root position, with A at the bottom.
Inside Notley Piano: all the inversions of Adim, 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 |
A diminished chord stacks two minor 3rds, so it has a flat 5th. It sounds tense and unstable, and is usually used as a passing chord.