piano.org › Chords › 9♯11 › C 9♯11 chord · /chords/dominant-9th-sharp-11th/c/
The C 9♯11 chord contains the notes C, D, E, F♯, G, and B♭ .
Notes: C, D, E, F♯, G, B♭ · Piano keys: C D E F♯ G B♭
You are here Extensions & Chord Color
1 The instrument 2 3 4 5 The major scale 6 7 8 9 10 Songs & progressions 11 12 13 14 15 Advanced harmony
‹ You are here Level 12 of 15 Extensions & Chord Color
› Reviewed for accuracy · Last updated July 2026 · Maintained by Justin Evans
Jump to any CHORD
C C♯ D♭ D D♯ E♭ E F F♯ G♭ G G♯ A♭ A A♯ B♭ B C♭ Major Minor Augmented Diminished Suspended 2nd Suspended 4th Major 6 Minor 6th Dominant 7th Major 7th Minor 7th Minor Major 7th Diminished 7th Half Diminished Augmented 7th Dominant 7th Sharp 11 Add 9 Major 9th Minor 9th Major 11th Minor 11th Major 13th Minor 13th Dominant 9th Dominant 7th ♭5 Major 6/9 Power Dominant 11th Dominant 13th Dominant 7th sus4 Dominant 9th sus4 Dominant 13th sus4 Dominant 7th ♭9 Dominant 7th ♯9 Dominant 7th ♭13 Dominant 7th ♯5 Dominant 9th ♭5 Dominant 9th ♯5 Dominant 7th ♭9 ♯11 Dominant 7th ♯9 ♯11 Dominant 7th ♭5 ♯9 Minor 11th ♭5 Minor 13th ♭5 Add 4 Minor Add 9 Minor Add 11 Major 7♯5 Major 7♭5 Minor 7♯5 Major 7♯11 Major 9♯11 Dominant 9♯11 Diminished Major 7th
Piano Deck · Chord
Three quick cards on C 9♯11
Answer on the keyboard, not with buttons. No login required.
Deal 3 cards → C
Practice C 9♯11 Reading about it is one thing. Drilling it is what makes it automatic.
Table of Contents 1. Introduction 2. Notes 3. Key Signature 4. Chords in Key 5. Related Chords 6. FAQ 7. Related Lessons Introduction The C 9♯11 chord is a six-note chord made up of C, D, E, F♯, G, and B♭.
Notes Notes: C – D – E – F♯ – G – B♭
Key Signature A chord has no key signature of its own, but the C 9♯11 is the tonic (I) chord of C Major , whose key signature has no sharps or flats .
Chords in the Key of C Major These are the triads built on each degree of the C major scale:
C 9♯11 — Frequently Asked Questions What is the C 9♯11 chord on piano? The C 9♯11 chord contains the notes C – D – E – F♯ – G – B♭ . On piano, play these notes together to sound the chord.
References & Further Reading The note names, intervals, fingering, and harmony on this chord page are grounded in the following sources. Public domain treatises and scores are linked to their full text; primary data reflects piano.org's own interval-derived dataset.
1 2 3 4 Spot something that looks off? Use the note form below — corrections are reviewed by hand.
Leave a note Spotted a typo, have a question, or want to add something? We read every note.