D double harmonic scale
The D double harmonic scale consists of the D (Perfect unison), Eb (Minor second), F# (Major third), G (Perfect fourth), A (Perfect fifth), Bb (Minor sixth) and C# (Major seventh) notes.

How to play the D double harmonic scale
- Find D (Root) on the piano keyboard
- Play Eb (Minor second) — 1 semitone above D
- Play F# (Major third) — 4 semitones above D
- Play G (Perfect fourth) — 5 semitones above D
- Play A (Perfect fifth) — 7 semitones above D
- Play Bb (Minor sixth) — 8 semitones above D
- Play C# (Major seventh) — 11 semitones above D
- Play all 7 notes in ascending order to perform the D double harmonic scale