G♭ (musical note)

G♭ (G-flat; also called Ges or sol bémol) is the seventh semitone of the solfège.

Notes of G Flat

It lies a diatonic semitone above F and a chromatic semitone below G, thus being enharmonic to F♯ (F-sharp) or fa dièse. However, in some temperaments, it is not the same as F♯. G♭ is a major third below B♭, whereas F♯ is a major third above D (a minor third below A).

When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the G♭ semitone is approximately 369.994 Hz.^[1] See musical pitch for a discussion of historical variations in frequency.

Designation by octave

Scientific designation	Helmholtz designation	Octave name	Frequency (Hz)	MIDI note number
G♭−1	G♭͵͵͵ or ͵͵͵G♭ or GGGG♭	Octocontra	11.562	6
G♭0	G♭͵͵ or ͵͵G♭ or GGG♭	Subcontra	23.125	18
G♭1	G♭͵ or ͵G♭ or GG♭	Contra	46.249	30
G♭2	G♭	Great	92.499	42
G♭3	g♭	Small	184.997	54
G♭4	g♭′	One-lined	369.994	66
G♭5	g♭′′	Two-lined	739.989	78
G♭6	g♭′′′	Three-lined	1479.978	90
G♭7	g♭′′′′	Four-lined	2959.955	102
G♭8	g♭′′′′′	Five-lined	5919.911	114
G♭9	g♭′′′′′′	Six-lined	11839.822	126
G♭10	g♭′′′′′′′	Seven-lined	23679.643	N/A

Scales

Common scales beginning on G♭

• G♭ major: G♭ A♭ B♭ C♭ D♭ E♭ F G♭
• G♭ natural minor: G♭ A♭ B C♭ D♭ E F♭ G♭
• G♭ harmonic minor: G♭ A♭ B C♭ D♭ E F G♭
• G♭ melodic minor ascending: G♭ A♭ B C♭ D♭ E♭ F G♭
• G♭ melodic minor descending: G♭ F♭ E D♭ C♭ B A♭ G♭

Diatonic scales

• G♭ Ionian: G♭ A♭ B♭ C♭ D♭ E♭ F G♭
• G♭ Dorian: G♭ A♭ B C♭ D♭ E♭ F♭ G♭
• G♭ Phrygian: G♭ A B C♭ D♭ E F♭ G♭
• G♭ Lydian: G♭ A♭ B♭ C D♭ E♭ F G♭
• G♭ Mixolydian: G♭ A♭ B♭ C♭ D♭ E♭ F♭ G♭
• G♭ Aeolian: G♭ A♭ B C♭ D♭ E F♭ G♭
• G♭ Locrian: G♭ A B C♭ D E F♭ G♭

Jazz melodic minor

• G♭ ascending melodic minor: G♭ A♭ B C♭ D♭ E♭ F G♭
• G♭ Dorian ♭2: G♭ A B C♭ D♭ E♭ F♭ G♭
• G♭ Lydian augmented: G♭ A♭ B♭ C D E♭ F G♭
• G♭ Lydian dominant: G♭ A♭ B♭ C D♭ E♭ F♭ G♭
• G♭ Mixolydian ♭6: G♭ A♭ B♭ C♭ D♭ E F♭ G♭
• G♭ Locrian ♮2: G♭ A♭ B C♭ D E F♭ G♭
• G♭ altered: G♭ A B C D E F♭ G♭