# G♯ Diminished 7th piano chord (G♯dim7) G♯dim7 contains G♯, B, D and F. Three stacked minor thirds. G♯ is a black key; B, D and F are white. - Canonical page: https://piano.org/chords/diminished-7th/g-sharp/ - Entity: chord:diminished-7th:g-sharp - Notes: G♯ B D F - Formula: 1 ♭3 ♭5 ♭♭7 - Intervals from root: P1, m3, TT, M6 - Interval stack (semitones): 3 3 3 - Also written: G♯dim7, G#dim7, G♯ diminished 7th - Parameters: A440, 12-TET, 165 mm octave, spans centre to centre ## Construction | Degree | Note | Interval from root | Semitones | | --- | --- | --- | --- | | 1 | G♯ | Perfect unison | 0 | | ♭3 | B | Minor third | 3 | | ♭5 | D | Tritone | 6 | | ♭♭7 | F | Major sixth | 9 | ## Fingering Rest your right hand over the notes with finger 2 on G♯, finger 3 on B, finger 4 on D, finger 5 on F. 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 | G♯ | G♯3 B3 D4 F4 | 7 | 9 st, 124 mm | | First inversion (G♯dim7/B) | B | B3 D4 F4 G♯4 | 6/5 | 9 st, 124 mm | | Second inversion (G♯dim7/D) | D | D4 F4 G♯4 B4 | 4/3 | 9 st, 124 mm | | Third inversion (G♯dim7/F) | F | F4 G♯4 B4 D5 | 4/2 | 9 st, 124 mm | ## Voicings (10) | Voicing | Notes | Span | Relation | Omits or adds | | --- | --- | --- | --- | --- | | Close, root position | G♯3 B3 D4 F4 | 9 st, 124 mm | identical | none | | Close, first inversion | B3 D4 F4 G♯4 | 9 st, 124 mm | identical | none | | Close, second inversion | D4 F4 G♯4 B4 | 9 st, 124 mm | identical | none | | Close, third inversion | F4 G♯4 B4 D5 | 9 st, 124 mm | identical | none | | Drop 2 | D3 G♯3 B3 F4 | 15 st, 206 mm | identical | none | | Drop 3 | B2 G♯3 D4 F4 | 18 st, 248 mm | identical | none | | Drop 2 and 4 | G♯2 D3 B3 F4 | 21 st, 289 mm | identical | none | | Shell, root ♭♭7 ♭3 | G♯2 F3 B3 | 15 st, 206 mm | subset | omits D | | Guide tones, ♭3 and ♭♭7 | B3 F4 | 6 st, 83 mm | subset | omits G♯ and D | | Rootless close | B3 D4 F4 | 6 st, 83 mm | subset | omits G♯ | ## One-edit neighbors | Becomes | Edit | Changes | Common tones | | --- | --- | --- | --- | | G♯dim | 1 ♭3 ♭5 | drops F | 3 | | G♯m7♭5 | 1 ♭3 ♭5 ♭7 | F becomes F♯ | 3 | | G♯m6 | 1 ♭3 5 6 | D becomes D♯ | 3 | | G♯m | 1 ♭3 5 | D, F becomes D♯ | 2 | | G♯m7 | 1 ♭3 5 ♭7 | D, F becomes D♯, F♯ | 2 | | G♯mMaj7 | 1 ♭3 5 7 | D, F becomes D♯, F× | 2 | | G♯6 | 1 3 5 6 | B, D becomes B♯, D♯ | 2 | ## Set theory - Absolute pitch classes: {8, 11, 2, 5} - Relative pitch classes: [0, 3, 6, 9] - Normal order: [2, 5, 8, 11] - Prime form: (0369) - Forte number: 4-28 - Interval vector: <004002> ## Frequencies (close root position) | Note | MIDI | Frequency | | --- | --- | --- | | G♯3 | 56 | 207.65 Hz | | B3 | 59 | 246.94 Hz | | D4 | 62 | 293.66 Hz | | F4 | 65 | 349.23 Hz | ## Questions and answers ### What notes are in G♯dim7? G♯dim7 contains G♯, B, D and F. The formula is 1, ♭3, ♭5, ♭♭7. ### How do you play G♯dim7 on piano? Play G♯, B, D and F together. Right hand fingers 2, 3, 4, 5; left hand 5, 4, 3, 2. G♯ is a black key; B, D and F are white. ### What are the inversions of G♯dim7? 4 positions: root position G♯ B D F, G♯dim7/B, G♯dim7/D, G♯dim7/F. ### What is the difference between G♯dim7 and G♯dim? Drops F. 3 of the notes are shared. ### What is an easy G♯dim7 for small hands? The guide tones, ♭3 and ♭♭7 voicing, B3 F4, spans 6 semitones or about 83 mm. ### What are the frequencies of G♯dim7? From G♯3 at A440 in 12-TET: 207.65, 246.94, 293.66, 349.23 Hz. ### What is the set class of G♯dim7? Prime form (0369), Forte 4-28, interval vector <004002>. ### How do I transpose G♯dim7 to another key? Keep the 1, ♭3, ♭5, ♭♭7 formula on the new root. C♯dim7 is C♯, E, G, B♭; Ddim7 is D, F, A♭, C♭. ### Is A♭dim7 the same as G♯dim7? 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:diminished-7th:g-sharp Last reviewed: 2026-08-12