C# 7(b9)(#9)

The C# 7(b9)(#9) chord consists of the C# (Perfect unison), F (Major third), G# (Perfect fifth), B (Minor seventh), D (Minor ninth) and E (Minor tenth) notes.

Piano keyboard showing the notes for a C# 7(b9)(#9) chord

How to play the C# 7(b9)(#9) chord

  1. Find C# (Root) on the piano keyboard
  2. Add F (Major third) — 4 semitones above C#
  3. Add G# (Perfect fifth) — 7 semitones above C#
  4. Add B (Minor seventh) — 10 semitones above C#
  5. Add D (Minor ninth) — 13 semitones above C#
  6. Add E (Minor tenth) — 15 semitones above C#
  7. Press all 6 notes simultaneously to sound the C# 7(b9)(#9) chord

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