A blues scale
The A blues scale consists of the A (Perfect unison), C (Minor third), D (Perfect fourth), D# (Diminished fifth), E (Perfect fifth) and G (Minor seventh) notes.

How to play the A blues scale
- Find A (Root) on the piano keyboard
- Play C (Minor third) — 3 semitones above A
- Play D (Perfect fourth) — 5 semitones above A
- Play D# (Diminished fifth) — 6 semitones above A
- Play E (Perfect fifth) — 7 semitones above A
- Play G (Minor seventh) — 10 semitones above A
- Play all 6 notes in ascending order to perform the A blues scale