Cmaj9♯11: C Major 9th Sharp 11th Piano Chord

Construction

C Major 9♯11 = Root + Major 3rd + Perfect 5th + Major 7th + Major 2nd + Diminished 5th = C, E, G, B, D, F♯

Note	Interval	Degree
C	Root	1
E	Major 3rd	3
G	Perfect 5th	5
B	Major 7th	7
D	Major 2nd	9
F♯	Diminished 5th	♭5

Key Signature

A chord has no key signature of its own, but the C Major 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 C Major:

I — C Major (major)

Degree	Numeral	Chord	Quality
1	I	C Major	Major
2	ii	D Minor	Minor
3	iii	E Minor	Minor
4	IV	F Major	Major
5	V	G Major	Major
6	vi	A Minor	Minor
7	vii°	B Diminished	Diminished

C Major 9♯11 : Frequently Asked Questions

What is the C Major 9♯11 chord on piano?

The C Major 9♯11 chord contains the notes C – E – G – B – D – F♯. On piano, play these notes together to sound the chord.