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Dominant 7th ♯5 Chords on Piano

The dominant 7th ♯5 chord raises the fifth of a dominant 7th by a half step, creating an augmented dominant sound full of upward tension. It is enharmonically identical to the augmented 7th chord and functions as an altered dominant that pulls strongly toward resolution — a staple of jazz turnarounds and sophisticated pop harmony.

Formula: Root – Major 3rd – Augmented 5th – Minor 7th
Scale degrees: 1–3–♯5–♭7
Sound: Tense, augmented, pulling upward, jazz
Symbol: 7♯5 (C7♯5)

Augmented 7th by another name: C7♯5 and Caug7 contain exactly the same notes: C–E–G♯–B♭. The difference is context — 7♯5 implies a dominant function (resolving to F), while aug7 can be more ambiguous. In practice, jazz musicians use the names interchangeably.

Dominant 7th ♯5 Chord in All 18 Keys

C Dominant 7th ♯5 Chord
C# Dominant 7th ♯5 Chord
Db Dominant 7th ♯5 Chord
D Dominant 7th ♯5 Chord
D# Dominant 7th ♯5 Chord
Eb Dominant 7th ♯5 Chord
E Dominant 7th ♯5 Chord
F Dominant 7th ♯5 Chord
F# Dominant 7th ♯5 Chord
Gb Dominant 7th ♯5 Chord
G Dominant 7th ♯5 Chord
G# Dominant 7th ♯5 Chord
Ab Dominant 7th ♯5 Chord
A Dominant 7th ♯5 Chord
A# Dominant 7th ♯5 Chord
Bb Dominant 7th ♯5 Chord
B Dominant 7th ♯5 Chord
Cb Dominant 7th ♯5 Chord