The F sharp augmented chord contains F♯, A♯ and C𝄪. Written F♯aug or F♯+, it uses formula 1–3–♯5. C𝄪 sounds on D; compare root position and two inversions.
Build the F sharp augmented chord by raising C♯, the fifth of F♯ major, to C𝄪. Keep F♯ and A♯. The fifth now lies eight semitones above F♯. A double sharp raises C by two semitones, so C𝄪 uses the D key rather than C natural.
Preserve the written spelling C𝄪 even when it shares a piano key with a simpler enharmonic name.
Choose a position to keep the written notes, sounding keys, bass note, playback and print reference synchronized.
Choose F♯, A♯ and the D pitch class for C𝄪. C♯ instead restores F♯ major; C natural is not the augmented fifth. The exercise checks three pitch classes without determining an inversion from octave or click order.
F♯aug uses 1–3–♯5: F♯–A♯–C𝄪.
Compared with F♯ major, raise the fifth by one semitone.
The chord tones stay the same while the lowest chord tone changes.
| Position | Symbol | Notes, low to high | Bass |
|---|---|---|---|
| Root position, current selection | F♯aug | F♯4–A♯4–C𝄪5 | F♯4 |
| First inversion | F♯aug/A♯ | A♯4–C𝄪5–F♯5 | A♯4 |
| Second inversion | F♯aug/C𝄪 | C𝄪5–F♯5–A♯5 | C𝄪5 |
The F sharp augmented chord diagrams preserve C𝄪 in the labels while marking D on the piano. A♯ starts the first inversion and C𝄪 the second. These are note and register references without finger numbers or a prescribed one-hand shape.
Use the written notes, keyboard positions and playback without treating the diagram as a required hand shape.
Read left- and right-hand finger numbersOpen Music Theory
Supports: augmented triad formula and written tone spelling
Scope: Supports the chord formula and spelling only; keyboard layouts are PianoGrid examples, and no fingering is assigned.
F♯, A♯ and C𝄪: root, major third and augmented fifth. F♯aug and F♯+ are compact names for this triad.
The F sharp augmented chord raises the perfect fifth C♯ by one semitone. Retaining the letter C identifies a fifth above F♯; its sounding key is D.
No. It identifies the raised fifth of this three-note collection. Adding a seventh would require another chord member and a corresponding symbol.
A♯ or C𝄪 becomes the lowest note while the same three pitch classes are retained. Use the displayed octave numbers to read the selected reference precisely.
Select the three pitch classes that make F♯aug, then check your answer.
This one-octave exercise checks pitch classes. Order and octave do not affect the result; fingering and live performance are not assessed.
One octave, C through B. Select a key again to remove it.
Chord tones: F♯–A♯–C𝄪 · Formula: 1, 3, ♯5
Dots mark the notes to play. C4 is middle C. Numbers identify octaves, not fingers.