C# add chords

C# add chords for piano with keyboard diagram.
Explanation: The C#add9 and C#add2 are four note chords. C#add2 is sometimes written as C#2.
Theory: Both chords contain the same notes, but the added notes belong to different octaves which are the ninth and the second notes in the scale.

C#add9

C#add9 chord diagram
Notes: C# - F - G# - D#

C#add2

C#add2 chord diagram
Notes: C# - D# - F - G#

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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