How to Play Piano Chord: C♯ half-diminished 11 — root

C♯m11♭5

root position

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root position

C♯, E, G, B, D♯, F♯

The notes of the C♯ major scale are:

Major scale pattern

The semitone pattern for a major scale is:

WWHWWWH

where:

1, ♭3, ♭5, ♭7, 9, 11

B major C♯ · B

B–D♯–F♯ = ♭7, 9, 11 · left hand: root + ♭7

a major triad a whole step down from the root
E minor C♯ · B

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

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