How to Play Piano Chord: C♯ half-diminished 9 — root | PianoKitty

C♯m9♭5

root position

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C♯ half-diminished 9

root position

Notes

C♯, E, G, B, D♯

Parent major scale: C♯

The notes of the C♯ major scale are:

#	Note	Function
1	C♯	root
2	D♯	second
3	F	third
4	F♯	fourth
5	G♯	fifth
6	A♯	sixth
7	C	seventh
8	C♯	octave
9	D♯	ninth

Major scale pattern

The semitone pattern for a major scale is:

WWHWWWH

where:

W = Whole step (2 semitones)
H = Half step (1 semitone)

half-diminished 9 chord pattern

1, ♭3, ♭5, ♭7, 9

root	C♯
flat third	E
flat fifth	G
flat seventh	B
ninth	D♯

Similar chords

C♯ half-diminished 7 with a major 3rd added on top (4 semitones)
D♭ dominant 9 flat 5 with raised third
C♯ minor 9 with raised fifth

Upper structures

C♯ diminished + D♭aug (notes overlap)

Play it as two chords

E minor C♯ · B

E–G–B = ♭3, ♭5, ♭7 · left hand: root + ♭7

Practice the half-diminished 9 chords Practice all inversions of C♯m9♭5

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