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

How to play the C# half diminished scale
- Find C# (Root) on the piano keyboard
- Play D# (Major second) — 2 semitones above C#
- Play E (Minor third) — 3 semitones above C#
- Play F# (Perfect fourth) — 5 semitones above C#
- Play G (Diminished fifth) — 6 semitones above C#
- Play A (Minor sixth) — 8 semitones above C#
- Play B (Minor seventh) — 10 semitones above C#
- Play all 7 notes in ascending order to perform the C# half diminished scale