Guitar Chord C#7#5: Structure, Notes and Theory

C#7#5 — a chord built on the note “C#” with an energetic sound and a strong pull toward resolution. A classic element of jazz and blues progressions, adding drive and a sense of phrase completion. The chord includes alterations: #5 — pushes the harmony forward, great for passing movements and modulations.

Formula and Structure of the C#7#5 Chord

Interval formula from the root note: 1 — 3 — #5 — b7. The chord consists of the following notes:

• Db — unison and the main tonal anchor.
• F — major third with a bright major quality and clear stability above the tonic.
• A — augmented fifth, driving motion forward and best avoided in the bass.
• B — minor seventh with dominant pull toward the tonic.

Together, these notes form the harmonic foundation of the C#7#5 chord, defining its sound and role in the musical context.

Alternative Names for the C#7#5 Chord

There are no alternative names for this chord.

Using the C#7#5 Chord

Build a stable frame from the 3 and b7, keeping them in fixed positions. Add colors (#9, b9, #11, b13) sparingly to preserve clarity. Classic usage is II–V–I, but it can also work in bebop runs. It’s useful to omit the fifth temporarily to make room for color tones.

Conclusion

C#7#5 is an expressive and versatile chord. Learn several fingerings, experiment with different positions and voice spacing, then try weaving it into your own playing — this will help you quickly find your unique tone.