C# m9(#11)

The C# m9(#11) chord consists of the C# (Perfect unison), E (Minor third), G# (Perfect fifth), B (Minor seventh), D# (Major ninth) and G (Augmented eleventh) notes.

Piano keyboard showing the notes for a C# m9(#11) chord

How to play the C# m9(#11) chord

  1. Find C# (Root) on the piano keyboard
  2. Add E (Minor third) — 3 semitones above C#
  3. Add G# (Perfect fifth) — 7 semitones above C#
  4. Add B (Minor seventh) — 10 semitones above C#
  5. Add D# (Major ninth) — 14 semitones above C#
  6. Add G (Augmented eleventh) — 18 semitones above C#
  7. Press all 6 notes simultaneously to sound the C# m9(#11) chord