F Augmented Seventh Chord
Chord Tones: F Augmented Seventh Chord
Symbol: aug7, +7, 7♯5 — Formula: 1-3-♯5-♭7
| Degree | Note | Frequency (A=440, Equal) |
|---|---|---|
| 1 | F | 349.228 Hz |
| 3 | A | 440.000 Hz |
| ♯5 | Db | 277.183 Hz |
| ♭7 | Eb | 311.127 Hz |
Chord Notation
| Notation Type | Symbol / Value |
|---|---|
| Lead Sheet Symbol | Faug7 |
| All Common Symbols | aug7, +7, 7♯5 |
| Interval Formula | 1-3-♯5-♭7 |
| Harmonic Category | unstable |
Roman numeral (e.g. I, IV, V) and Nashville Number notation are key-dependent. See Keys pages for chord function within specific keys.
Inversions
| Inversion | Notes (low to high) | Bass Note | Slash Notation |
|---|---|---|---|
| Root Position | F – A – Db – Eb | F | F Augmented Seventh Chord |
| First Inversion | A – Db – Eb – F | A | F Augmented Seventh Chord/A |
| Second Inversion | Db – Eb – F – A | Db | F Augmented Seventh Chord/Db |
| Third Inversion | Eb – F – A – Db | Eb | F Augmented Seventh Chord/Eb |
Harmonic Function
The F augmented seventh chord commonly functions as the subdominant (IV) in C major — plagal cadence endpoint. Its harmonic role varies by key — in major keys it provides extended harmonic tension.
The augmented seventh chord adds a minor seventh to the augmented triad, combining the restlessness of an augmented fifth with the tension of a dominant seventh. Used for maximum harmonic tension.
Common Progressions
The F Augmented Seventh Chord frequently appears in these progression patterns (shown in Roman numeral notation relative to key):
V+7-II+7-IV
Songs Featuring the Augmented Seventh Chord
Well-known songs where the F Augmented Seventh Chord — or this chord type — plays a prominent role:
- Whole Lotta Love – Led Zeppelin
- Come Together – Beatles (chord variant)
- Spanish Key – Miles Davis
Tuning Frequencies Across Temperaments
Frequencies shown at A=440 Hz. View full temperament data for any note.
| Note | Equal Temp. | Pythagorean | Just Intonation |
|---|---|---|---|
| F | 349.228 Hz | 347.654 Hz | 348.834 Hz |
| A | 440.000 Hz | 440.000 Hz | 436.043 Hz |
| Db | 277.183 Hz | 278.437 Hz | 279.067 Hz |
| Eb | 311.127 Hz | 309.026 Hz | 313.951 Hz |
Scales Containing the F Augmented Seventh Chord
These scales include the F Augmented Seventh Chord as a diatonic or characteristic chord: