Tips for Learning the G# / Ab Blues Scale on Guitar
It is G# minor pentatonic plus one note
Take G# minor pentatonic (G# B C# D# F#) and slip a D between the 4th (C#) and 5th (D#). That single ♭5 — the "blue note" — is the only difference from the pentatonic box.
The blue note is a passing tone
The D♮ sounds tense on its own — use it to pass through, bending or sliding from C# up to D#, rather than landing on it. In motion it gives the scale its vocal cry.
The first box at fret 4
Anchor position 1 at fret 4 with the root G# on the low E string — the same shape as G# minor pentatonic, with the D one fret below the D# on each string.
Same scale, two spellings
G# blues and Ab blues are the same six notes — guitarists usually read it as G# in sharp keys and Ab when the surrounding music is flat (where it spells Ab Cb Db D Eb Gb). The fingerings are identical either way.
Target G#, B, and D#
Those three notes spell a G# minor chord and make phrases sound resolved. C#, D, and F# are colour tones — the D blue note is the spiciest, best saved for tension.
About the G# / Ab Blues Scale
The G# blues scale is six notes — G#, B, C#, D, D#, F# — the G# minor pentatonic scale with one extra note, the ♭5 (D), added between the 4th and 5th. That added tone is the famous "blue note": it creates the tense, vocal, crying sound that defines blues and rock lead guitar. Written in flats it is the Ab blues scale — the same six notes, two spellings. On the fretboard it sits in the same five box positions as G# minor pentatonic, the first box anchored at fret 4, with the blue note one fret below the 5th on each string.
- 01Notes: G# – B – C# – D – D# – F#
- 02Scale degrees: 1 – ♭3 – 4 – ♭5 – 5 – ♭7
- 03Built by adding the ♭5 (D) "blue note" to G# minor pentatonic
- 04Six notes — the minor pentatonic plus one chromatic passing tone
- 05Same scale as Ab blues — two spellings, identical fingering
- 06Shares the same five box shapes as G# minor pentatonic
- 07Works over G# minor, G#7, and twelve-bar blues in G#
G# / Ab Blues — note by note
Every blues scale uses the same six-note formula — scale degrees 1, ♭3, 4, ♭5, 5, and ♭7. It is the minor pentatonic with the ♭5 "blue note" added between the 4th and 5th, the chromatic passing tone that gives the blues scale its signature tension and vocal cry.
| Degree | Note | Role | Interval (from root) |
|---|---|---|---|
| 1 | G# / Ab | Root (tonic) | Unison (0 st) |
| ♭3 | B | Minor third | +3 semitones |
| 4 | C# / Db | Perfect fourth | +5 semitones |
| ♭5 | D | Blue note (♭5) | +6 semitones |
| 5 | D# / Eb | Perfect fifth | +7 semitones |
| ♭7 | F# / Gb | Minor seventh | +10 semitones |