# G♭ Diminished 7th piano chord (G♭dim7) G♭dim7 contains G♭, B♭♭, D♭♭ and F♭♭. Three stacked minor thirds. G♭ and F♭♭ are black keys; B♭♭ and D♭♭ are white. - Canonical page: https://piano.org/chords/diminished-7th/g-flat/ - Entity: chord:diminished-7th:g-flat - 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, Gbdim7, 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 B♭♭3 D♭♭4 F♭♭4 | 7 | 9 st, 124 mm | | First inversion (G♭dim7/B♭♭) | B♭♭ | B♭♭3 D♭♭4 F♭♭4 G♭4 | 6/5 | 9 st, 124 mm | | Second inversion (G♭dim7/D♭♭) | D♭♭ | D♭♭4 F♭♭4 G♭4 B♭♭4 | 4/3 | 9 st, 124 mm | | Third inversion (G♭dim7/F♭♭) | F♭♭ | F♭♭4 G♭4 B♭♭4 D♭♭5 | 4/2 | 9 st, 124 mm | ## Voicings (10) | Voicing | Notes | Span | Relation | Omits or adds | | --- | --- | --- | --- | --- | | Close, root position | G♭3 B♭♭3 D♭♭4 F♭♭4 | 9 st, 124 mm | identical | none | | Close, first inversion | B♭♭3 D♭♭4 F♭♭4 G♭4 | 9 st, 124 mm | identical | none | | Close, second inversion | D♭♭4 F♭♭4 G♭4 B♭♭4 | 9 st, 124 mm | identical | none | | Close, third inversion | F♭♭4 G♭4 B♭♭4 D♭♭5 | 9 st, 124 mm | identical | none | | Drop 2 | D♭♭3 G♭3 B♭♭3 F♭♭4 | 15 st, 206 mm | identical | none | | Drop 3 | B♭♭2 G♭3 D♭♭4 F♭♭4 | 18 st, 248 mm | identical | none | | Drop 2 and 4 | G♭2 D♭♭3 B♭♭3 F♭♭4 | 21 st, 289 mm | identical | none | | Shell, root ♭♭7 ♭3 | G♭2 F♭♭3 B♭♭3 | 15 st, 206 mm | subset | omits D♭♭ | | Guide tones, ♭3 and ♭♭7 | B♭♭3 F♭♭4 | 6 st, 83 mm | subset | omits G♭ and D♭♭ | | Rootless close | B♭♭3 D♭♭4 F♭♭4 | 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: {6, 9, 0, 3} - Relative pitch classes: [0, 3, 6, 9] - Normal order: [0, 3, 6, 9] - Prime form: (0369) - Forte number: 4-28 - Interval vector: <004002> ## Frequencies (close root position) | Note | MIDI | Frequency | | --- | --- | --- | | G♭3 | 54 | 185.00 Hz | | B♭♭3 | 57 | 220.00 Hz | | D♭♭4 | 60 | 261.63 Hz | | F♭♭4 | 63 | 311.13 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♭ and F♭♭ are black keys; B♭♭ and D♭♭ 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, B♭♭3 F♭♭4, spans 6 semitones or about 83 mm. ### What are the frequencies of G♭dim7? From G♭3 at A440 in 12-TET: 185.00, 220.00, 261.63, 311.13 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 F♯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-flat Last reviewed: 2026-08-12