C7♯5 Chord: Guitar, Piano and Notes

The C7♯5 chord is a altered dominant seventh chord built on the root note C. Its notes are C, E, G♯ and B♭.

Transpose
Quality
Short answer

Dominant seventh sharp five chords sound restless and a little exotic. Raising the fifth of a dominant seventh trades its usual bluesy pull for a sharper, whole-tone edge, a colour jazz and gospel players reach for right before a cadence.

Notes
C · E · G♯ · B♭
Formula
1 · 3 · ♯5 · ♭7
Semitones
0 · 4 · 8 · 10
Note
C
Quality
Dominant 7♯5
Symbol
C7♯5

C7♯5 on piano

4 notes
View:
Piano diagram of the C7♯5 chord

Switch to the interactive diagram to hear the chord, change voicing and swap finger numbers for note names.

To play C7♯5 on piano, place your right hand with your thumb on C, index finger on E, middle finger on G♯ and little finger on B♭. Press the keys together and listen for an even sound. Practice moving in and out of the chord slowly, then bring in a metronome.

  • C1
  • E3
  • G♯♯5
  • B♭♭7

C7♯5 on guitar

View:
Guitar chord diagram of the C7♯5 chord

Switch to the interactive diagram to hear the chord, change voicing and swap finger numbers for note names.

On guitar, C7♯5 is commonly played with the voicing shown above. Strum only the strings marked as active in the diagram.

C7♯5 chord notes

DegreeIntervalSemitonesNoteHear
1Root0C
3Major third4E
♯5Augmented fifth8G♯(G#)
♭7Minor seventh10B♭(Bb)

How to use the C7♯5 chord

The C7♯5 chord is built from a root, a major third, an augmented fifth and a minor seventh. Start at the root C and stack the intervals to get the whole chord: C, E, G♯ and B♭. The same formula gives you the chord in any other key.

Dominant seventh sharp five chords turn up in jazz and gospel as an altered V7 resolving to the tonic, especially where the melody climbs through the raised fifth. They are a common sound in turnarounds right before landing back on I.

Where C7♯5 is used

A dominant chord wants to resolve. Its home is the V of a major key - and the I of a blues, where the pull never lets up.

As the VF major
  1. ii7Gm7
  2. V7♯5C7♯5
  3. Imaj7Fmaj7

C7♯5 is the chord that wants to resolve, so ending the loop on it hands straight back to the top.

Questions people ask

What notes are in the C7♯5 chord?
The C7♯5 chord contains C, E, G♯ and B♭ (C, E, G# and Bb in plain text).
Is the C7♯5 chord major or minor?
C7♯5 is a altered dominant seventh chord. Dominant seventh sharp five chords sound restless and a little exotic. Raising the fifth of a dominant seventh trades its usual bluesy pull for a sharper, whole-tone edge, a colour jazz and gospel players reach for right before a cadence.
How do you play C7♯5 on piano?
Place your fingers on C, E, G♯ and B♭ and play them together. The root usually goes to the little finger of the left hand, the upper notes to the right.
How do you play C7♯5 on guitar?
C7♯5 is typically played with the fingering shown in the diagram above. If one of the chord tones lines up with an open string, an open position is worth trying too.
What chords work well with C7♯5?
C7♯5 pairs naturally with the chords in the related section: a perfect fifth up or down, the relative major or minor, and anything sharing two notes with it.