A Diminished (Half-Whole) Scale on Guitar — 1 Shape to Play the Whole Neck
A Diminished (Half-Whole) is a symmetric scale, built from a repeating interval pattern rather than the uneven step sizes of a traditional major or minor scale — its notes are A Bb C C# D# E F# G, from the formula 1 b2 b3 3 #4 5 6 b7. For this root it computes to 1 repeating shape.
A Diminished (Half-Whole) Scale Notes
| Degree | Note | Interval |
|---|---|---|
| 1 | A | 1 |
| 2 | Bb | b2 |
| 3 | C | b3 |
| 3 | C# | 3 |
| 4 | D# | #4 |
| 5 | E | 5 |
| 6 | F# | 6 |
| 7 | G | b7 |
A Diminished (Half-Whole) Formula
Degree formula: 1 b2 b3 3 #4 5 6 b7
Half – Whole – Half – Whole – Half – Whole – Half – Whole
A Diminished (Half-Whole) on the Guitar Fretboard
The notes of Diminished (Half-Whole) repeat across the guitar fretboard in connected positions. Use the shape below to identify root notes, scale degrees, and neighboring shapes.
- Frets 2–12 (span 10 frets)
- Lowest note D#, highest note G
- 1 A root note, on the D string (fret 7)
How to practice this shape
- Start on the root — A at fret 7 on the D string. Play up to the highest note in the shape, then back down, staying inside frets 2–12.
- Your hand shifts 5 times as you cross strings: E→A (-2), A→D (-2), D→G (-2), G→B (-1), B→E (-2). Those crossings — not the notes — are what this position is really asking you to learn.
- Once it feels automatic, move it up the neck: this scale needs only 1 shape, so the same fingering repeats everywhere.
What Gives A Diminished (Half-Whole) Its Sound?
The characteristic sound of A Diminished (Half-Whole) comes from its minor 2nd, major 3rd, and minor 6th.
Diatonic chords
These are the 6 chords built from A Diminished (Half-Whole)'s own notes — the ones that will sound like they belong when you're writing a progression, backing a melody, or jamming in this key. The Roman numeral shows each chord's role in the key: capital for major, lowercase for minor, ° for diminished, + for augmented. Not every scale produces a clean chord on every degree — where that happens, we show it honestly instead of forcing a name that doesn't fit.
A Diminished (Half-Whole) vs A Diminished (Whole-Half)
A Diminished (Half-Whole) and A Diminished (Whole-Half) differ on 5 degrees: the 2nd (b2 vs 2), the 3rd (3 vs b3), the 4th (#4 vs 4), the 5th (5 vs b5), the 7th (b7 vs 7).
A Diminished (Half-Whole) FAQ
A Diminished (Half-Whole) contains the notes A, Bb, C, C#, D#, E, F#, G.
A Diminished (Half-Whole) is built from a repeating interval pattern rather than the uneven step sizes of a major or minor scale.
A Diminished (Half-Whole)'s formula is 1 b2 b3 3 #4 5 6 b7.