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New Released in April 2026

C Sharp Augmented Chord on Piano (C#aug)

To play C#aug on the piano, press C#, E#, G## together. Start from C# and move the fifth up a semitone: that one key turns it into C#aug. Below: the keyboard, the three positions, how it compares with C# and C#m, and where it goes next.

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  • MIDI keyboard
  • Digital or acoustic piano
  • Guitar
  • Computer, phone or tablet
C#aug C# E# G##

Where C#aug goes

  • C#aug is the III+ chord in the harmonic minor scale of A# minor.
  • Its thirds are equal, so C#aug, Faug and Aaug use the same three keys: the root is whichever note you treat as home.
  • A common move is C# → C#aug → F#: the raised fifth G## pushes up to A#.

F# · C#

C#aug on the keyboard: three positions

Any order of C#, E#, G## is still C#aug.

C#aug C# E# G##

Root position: C# E# G##

C#aug E# G## C#

1st inversion: E# G## C#

C#aug G## C# E#

2nd inversion: G## C# E#

  • Root position: starts on C#, a black key; black keys: C#
  • 1st inversion: starts on E#, a white key; black keys: C#
  • 2nd inversion: starts on G##, a white key; black keys: C#

What makes C#aug different

One key changes and the chord changes family.

ChordNotesThirdFifth
C# C# E# G#major 3rdperfect 5th
C#m C# E G#minor 3rdperfect 5th
C#dim C# E Gminor 3rddiminished 5th
C#aug C# E# G##major 3rdaugmented 5th
ChordRunner showing a chord block while hands play the piano

Practise C#aug by playing

In ChordRunner C#aug rides towards your runner between other chords: play it in time. MIDI keyboard or microphone, both work.

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All piano chords · Augmented chords explained

Common questions

How do you play C#aug on the piano?

Press C#, E#, G## together: right hand 1-3-5 with the thumb on C#, left hand 5-3-1 with the little finger on C#.

What is the difference between C#aug and C#?

One note. C# has G# on top; C#aug moves it to G##. The new fifth is what gives C#aug its floating, unresolved sound.

Where does C#aug go?

C#aug is the III+ chord in the harmonic minor scale of A# minor. Its thirds are equal, so C#aug, Faug and Aaug use the same three keys: the root is whichever note you treat as home.

Can I practise C#aug with a MIDI keyboard or microphone?

Yes. ChordRunner detects a USB MIDI keyboard automatically and also hears an acoustic piano through the microphone. C#aug counts in any position, as long as C#, E#, G## sound together.

Your instrument is the controller.

ChordRunner is a browser game that teaches piano and guitar chords: a chord appears on screen, you play it on a real instrument, and your runner jumps. MIDI keyboard or microphone, both work.

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