C#13(#9) Guitar Chord Chart and Fingering
C#13(#9) (C# thirteenth sharp nine) follows the formula 1, 3, 5, b7, #9, 11, 13, so on C# it reads C#, E#, G#, B, D##, F# and A#.
Its core is the dominant seventh C#7 (C#, E#, G#, B), topped by the sharp ninth D##, the eleventh F# and the thirteenth A#. The C# Half-Whole scale fits it, since it holds every chord tone except the eleventh.
The sharp ninth D## sounds like E, so the chord carries a major third and a minor third colour at once. It is often heard in blues and funk.
C# 13th with sharp 9th guitar chord is also written as C#13(#9), C#13#9 or C#13+9.
Notes that compose the C# 13(#9) chord:
Tones of the Dominant Thirteen Sharp Ninth chord:
Formula: 1 3 5 b7 #9 11 13
C# 13(#9) Chord Interactive Fretboard
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Created by
Giancarlo is a musician (teaching guitar since 2000), software engineer, AI consultant and published researcher
FAQ
Which notes does C#13(#9) contain?
C#13(#9) contains C#, E#, G#, B, D##, F# and A#. They are the root, major third, perfect fifth, minor seventh, sharp ninth, eleventh and thirteenth.
Are C#13(#9) and Db13(#9) the same chord?
Yes, they sound identical. Db13(#9) is spelled Db, F, Ab, Cb, E, Gb and Bb, so only the note names differ.
Why does C#13(#9) have both E# and D##?
E# is the major third and D## is the sharp ninth. The two notes are a half step apart in sound, and that clash is the signature of this chord.
Which scale goes with C#13(#9)?
The C# half-whole scale fits every chord tone except the eleventh, F#. It includes the sharp ninth, D##, and the thirteenth, A#.
