A♭ (musical note)

A♭ (A-flat; also called la bémol) is the ninth semitone of the solfège.

It lies a diatonic semitone above G and a chromatic semitone below A, thus being enharmonic to G, even though in some musical tunings, A♭ will have a different sounding pitch than G♯.

When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the A♭ above middle C (or A♭4) is approximately 415.305 Hz. See pitch (music) for a discussion of historical variations in frequency.

The notes A♭ and G♯ are the only notes to have only one enharmonic, since they cannot be reached in any other way by a single or double sharp or a single or double flat from any of the seven white notes.

Common scales beginning on A♭

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

Diatonic scales

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

Jazz melodic minor

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