C# sixth/ninth chord

C#6/9 chord for piano with keyboard diagram.
Explanation: The C sharp sixth/ninth is a five note chord. Due to practical circumstances, however, the fifth (G#) is often omitted and/or the chord is played inverted. The chord is abbreviated C#6/9.
Theory: The C#6/9 chord is constructed with a root, a major third, a perfect fifth, a major sixth and a major ninth.

C#6/9

C#6/9 piano chord
Notes: C# - F - G# - A# - D#

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C# chord categories

C# C#m C#7 C#m7 C#maj7 C#6 C#m6 C#6/9 C#5 C#9 C#m9 C#maj9 C#11 C#13 C#add C#7-5 C#7+5 C#sus C#dim C#aug