C 7♯5♯9 - PIANO

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Chord composition

I III ♯V ♭VII ♯IX
Root Major third Augmented fifth Minor seventh Augmented ninth
C E G# A# D#

ALL ABOUT THE C 7♯5♯9 CHORD

Chord Composition

The C 7♯5♯9 chord is composed of 5 notes :

  • C (Root)
  • E (Major third)
  • G# (Augmented fifth)
  • A# (Minor seventh)
  • D# (Augmented ninth)

These notes form an ultra-altered chord combining augmented fifth and ninth.

How to play C 7♯5♯9 on piano

The 7#5#9 chord C 7♯5♯9 combines two alterations: augmented fifth (#5) and augmented ninth (#9).

  • Double alteration: maximum tension with two altered notes
  • Modern jazz: used in very chromatic contexts
  • Complex voicings: difficult to voice completely on piano
  • Dramatic resolution: creates extreme tension

This very sophisticated chord requires appropriate harmonic context to be effective.

Common uses of C 7♯5♯9

The 7#5#9 chord has specialized uses:

  • Avant-garde jazz: ultra-altered dominants
  • Modern bebop: complex harmonic substitutions
  • Fusion: extreme harmonic colors

Styles

Modern jazz: ultra-sophisticated harmonies.

Avant-garde: extreme harmonic exploration.

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