The F♯ aug7 Chord Explained
F-sharp augmented seventh is an Augmented chord family chord built from the notes F♯, A♯, C♯♯, and E. Its root is F♯, and its interval formula is 1–3–♯5–♭7, which gives you the interval names root, major third, augmented fifth, and minor seventh. You may also see it written as F♯+7, F♯7♯5, or plain-text spellings like F-sharp augmented 7th. If you look at the widget above, you can see and hear how these four notes combine, and if you want to learn more about how formulas like this work, see chord intervals.
F♯ aug7 Alternate Names
- F♯+7
- F♯7♯5
- F-sharp augmented 7th
F♯ aug7 Chord Notes
F♯ aug7 Chord Formula
F♯ aug7 Chord Notation
How To Use F♯ aug7 In Music
Because of its raised fifth and minor seventh, this chord has a bright but unstable sound that feels tense, colorful, and ready to move somewhere else. It often appears as a dominant-type chord leading strongly to a resolution, so F♯ aug7 can point nicely toward B or B minor depending on the musical setting. For example, in the key of B major, it may function as V+ in a progression like ii–V+–I, or in a bluesy or jazzy setting you might hear I–IV–V+–I. The mood can feel more dramatic or more smooth depending on the chords around it, especially when it resolves after simpler sounds such as a major chord.
F♯ aug7 Chord Inversions
Another helpful idea is inversion, which means using a chord note other than the root as the lowest note. For F♯ aug7, root position is F♯–A♯–C♯♯–E, first inversion is A♯–C♯♯–E–F♯, second inversion is C♯♯–E–F♯–A♯, and third inversion is E–F♯–A♯–C♯♯. These inversions keep the same basic chord quality, but they can change the weight, smoothness, and direction of the sound. A bassist or pianist might choose an inversion to create stepwise motion in the bass, make a progression easier to connect, or give the chord a softer or more unsettled color before it resolves.
