A phrygian 13 scale
The A phrygian 13 scale consists of the A (Perfect unison), A# (Minor second), C (Minor third), D (Perfect fourth), D# (Diminished fifth), F# (Major sixth) and G (Minor seventh) notes.

How to play the A phrygian 13 scale
- Find A (Root) on the piano keyboard
- Play A# (Minor second) — 1 semitone above A
- 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 F# (Major sixth) — 9 semitones above A
- Play G (Minor seventh) — 10 semitones above A
- Play all 7 notes in ascending order to perform the A phrygian 13 scale