Guitar Chord Dictionary: C# Augmented Fifth Sharp Eleventh added Chords
The C# augmented sharp eleven chord (C#+(#11)) combines C#, E#, G## and F##, that is the root, major third, raised fifth and sharp eleventh. The sharp eleventh sits a tritone above the root, six semitones up.
The C# Lydian augmented scale contains all four chord tones, which makes it a reliable scale for soloing over C#+(#11). The notes E#, G## and F## are theoretical spellings, which is why charts tend to write Db+(#11) instead. The natural eleventh would clash with the major third, which is why the raised eleventh is the usable colour.
See jazz chord progressions for the places where chords like this one tend to turn up.
C# augmented with sharp 11th guitar chord is also written as C#+(#11), C#aug(#11), C#+#11 or C#aug#11.
C# +(#11) chord Notes:
Chord formula for the Augmented Fifth Sharp Eleventh added chord:
Formula: 1 3 #5 #11
C# +(#11) 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 spell C# augmented sharp eleven?
The notes are C#, E#, G## and F##. They are the root, major third, raised fifth and sharp eleventh. The double sharps come from raising notes that are already sharp.
Why does C#+(#11) contain F##?
The perfect fourth of C# is F#, so the sharp eleventh is F##, one semitone higher. It sounds like G, but the letter F is kept so that the interval is named correctly.
Is C#+(#11) the same chord as Db+(#11)?
They use the same pitches. Db+(#11) is spelled Db, F, A and G, which is much easier to read. The two names sound identical.
What scale covers C#+(#11)?
The C# Whole-Tone Scale (C#, D#, E#, F##, G##, B) holds all four notes of the chord. Each one is a member of the scale.
