C 7♯9♯11
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C7♯9♯11
C – E – G – B♭ – D♯ – F♯
Formula:R-M3-P5-m7-A9-A11
Intervals:P1-M3-P5-m7-A9-A11
Scale Degrees:1-3-5-b7-#9-#11
Introduction
The C 7♯9♯11 chord is a six-note chord made up of C, E, G, B♭, D♯, and F♯. It is built from a root, major third, perfect fifth, minor seventh, augmented ninth, and augmented eleventh.
Notes
Key Signature
The key of C 7♯9♯11 has no sharps or flats. Every note is natural, which makes it the easiest key signature to read on the staff.
Chords in the Key of C Major
These are the diatonic triads built on each degree of the C major scale:
C
D
E
F
G
A
B
C
D
E
F
G
A
B
I — C Major (major)
Theory: Intervals
Formula: R-M3-P5-m7-A9-A11
Intervals: P1-M3-P5-m7-A9-A11
The C 7♯9♯11 is built by stacking intervals from the root note. The formula R-M3-P5-m7-A9-A11 describes the scale degrees used. The intervals P1-M3-P5-m7-A9-A11 show the distance between each note in the chord.
C 7♯9♯11 — Frequently Asked Questions
What notes are in the C 7♯9♯11 chord?
The C 7♯9♯11 chord (C7♯9♯11) contains 6 notes: C, E, G, Bb, D#, F#. Formula: R-M3-P5-m7-A9-A11.
How is C7♯9♯11 used in music?
C7♯9♯11 is used in jazz, fusion, and contemporary music to add harmonic color. It appears as a dominant or tonic chord depending on context.
What is the scale degree formula for C7♯9♯11?
C7♯9♯11 uses scale degrees 1-3-5-b7-#9-#11, giving it its distinctive sound.
Practice Tips
- Start by placing your thumb on C and spacing remaining fingers across the chord.
- Practice C7♯9♯11 slowly with separate hands before combining.
- Listen carefully to the tension created by the altered tones in this chord.
- Try voicing C7♯9♯11 in different octaves to find the most comfortable position.
- Resolve C7♯9♯11 to a nearby chord to hear its function in context.
Related Tools
Chord FinderLook up any chord — see the notes, hear it, and play along.Chord DrillTimed drills to build speed and recognition across all chord types.Practice RoomPlug in a MIDI keyboard and get real-time feedback on every chord and scale.Circle of FifthsVisualize key relationships, relative minors, and key signatures.MIDI MonitorLive MIDI message stream with note names, velocity, and a scrolling staff.