# A♭ Augmented 7th piano chord (A♭aug7) A♭aug7 contains A♭, C, E and G♭. An augmented triad with the minor seventh added on top. A♭ and G♭ are black keys; C and E are white. - Canonical page: https://piano.org/chords/augmented-7th/a-flat/ - Entity: chord:augmented-7th:a-flat - Notes: A♭ C E G♭ - Formula: 1 3 ♯5 ♭7 - Intervals from root: P1, M3, m6, m7 - Interval stack (semitones): 4 4 2 - Also written: A♭aug7, Abaug7, A♭ augmented 7th - Parameters: A440, 12-TET, 165 mm octave, spans centre to centre ## Construction | Degree | Note | Interval from root | Semitones | | --- | --- | --- | --- | | 1 | A♭ | Perfect unison | 0 | | 3 | C | Major third | 4 | | ♯5 | E | Minor sixth | 8 | | ♭7 | G♭ | Minor seventh | 10 | ## Fingering Rest your right hand over the notes with finger 2 on A♭, finger 3 on C, finger 4 on E, finger 5 on G♭. The left hand mirrors it. Right hand 2-3-4-5, left hand 5-4-3-2. Source: piano.org fingering method v1. ## Inversions | Position | Bass | Notes in order | Figured bass | Span | | --- | --- | --- | --- | --- | | Root position | A♭ | A♭3 C4 E4 G♭4 | 7 | 10 st, 138 mm | | First inversion (A♭aug7/C) | C | C4 E4 G♭4 A♭4 | 6/5 | 8 st, 110 mm | | Second inversion (A♭aug7/E) | E | E4 G♭4 A♭4 C5 | 4/3 | 8 st, 110 mm | | Third inversion (A♭aug7/G♭) | G♭ | G♭4 A♭4 C5 E5 | 4/2 | 10 st, 138 mm | ## Voicings (10) | Voicing | Notes | Span | Relation | Omits or adds | | --- | --- | --- | --- | --- | | Close, root position | A♭3 C4 E4 G♭4 | 10 st, 138 mm | identical | none | | Close, first inversion | C4 E4 G♭4 A♭4 | 8 st, 110 mm | identical | none | | Close, second inversion | E4 G♭4 A♭4 C5 | 8 st, 110 mm | identical | none | | Close, third inversion | G♭4 A♭4 C5 E5 | 10 st, 138 mm | identical | none | | Drop 2 | E3 A♭3 C4 G♭4 | 14 st, 193 mm | identical | none | | Drop 3 | C3 A♭3 E4 G♭4 | 18 st, 248 mm | identical | none | | Drop 2 and 4 | A♭2 E3 C4 G♭4 | 22 st, 303 mm | identical | none | | Shell, root ♭7 3 | A♭2 G♭3 C4 | 16 st, 220 mm | subset | omits E | | Guide tones, 3 and ♭7 | C4 G♭4 | 6 st, 83 mm | subset | omits A♭ and E | | Rootless close | C4 E4 G♭4 | 6 st, 83 mm | subset | omits A♭ | ## One-edit neighbors | Becomes | Edit | Changes | Common tones | | --- | --- | --- | --- | | A♭aug | 1 3 ♯5 | drops G♭ | 3 | | A♭7 | 1 3 5 ♭7 | E becomes E♭ | 3 | | A♭9 | 1 3 5 ♭7 9 | E becomes E♭, B♭ | 3 | | A♭ | 1 3 5 | E, G♭ becomes E♭ | 2 | | A♭maj7 | 1 3 5 7 | E, G♭ becomes E♭, G | 2 | | A♭m7 | 1 ♭3 5 ♭7 | C, E becomes C♭, E♭ | 2 | | A♭m7♭5 | 1 ♭3 ♭5 ♭7 | C, E becomes C♭, E♭♭ | 2 | | A♭7sus4 | 1 4 5 ♭7 | C, E becomes D♭, E♭ | 2 | | A♭6 | 1 3 5 6 | E, G♭ becomes E♭, F | 2 | | A♭add9 | 1 3 5 9 | E, G♭ becomes E♭, B♭ | 2 | ## Set theory - Absolute pitch classes: {8, 0, 4, 6} - Relative pitch classes: [0, 4, 8, 10] - Normal order: [4, 6, 8, 0] - Prime form: (0248) - Forte number: 4-24 - Interval vector: <020301> ## Frequencies (close root position) | Note | MIDI | Frequency | | --- | --- | --- | | A♭3 | 56 | 207.65 Hz | | C4 | 60 | 261.63 Hz | | E4 | 64 | 329.63 Hz | | G♭4 | 66 | 369.99 Hz | ## Questions and answers ### What notes are in A♭aug7? A♭aug7 contains A♭, C, E and G♭. The formula is 1, 3, ♯5, ♭7. ### How do you play A♭aug7 on piano? Play A♭, C, E and G♭ together. Right hand fingers 2, 3, 4, 5; left hand 5, 4, 3, 2. A♭ and G♭ are black keys; C and E are white. ### What are the inversions of A♭aug7? 4 positions: root position A♭ C E G♭, A♭aug7/C, A♭aug7/E, A♭aug7/G♭. ### What is the difference between A♭aug7 and A♭aug? Drops G♭. 3 of the notes are shared. ### What is an easy A♭aug7 for small hands? The guide tones, 3 and ♭7 voicing, C4 G♭4, spans 6 semitones or about 83 mm. ### What are the frequencies of A♭aug7? From A♭3 at A440 in 12-TET: 207.65, 261.63, 329.63, 369.99 Hz. ### What is the set class of A♭aug7? Prime form (0248), Forte 4-24, interval vector <020301>. ### How do I transpose A♭aug7 to another key? Keep the 1, 3, ♯5, ♭7 formula on the new root. Caug7 is C, E, G♯, B♭; D♭aug7 is D♭, F, A, C♭. ### Is G♯aug7 the same as A♭aug7? Enharmonically yes: the same piano keys and the same sound, spelled differently. ## Provenance Every derived value above is computed by the piano.org theory kernel from the root, the quality and the stated parameters. Nothing is hand-entered per chord. Machine record: https://piano.org/api/knowledge/v1/entities/chord:augmented-7th:a-flat Last reviewed: 2026-08-12