A♯ (musical note)

For other uses, see A♯.

A♯ (A-sharp), or La Dièse, is the eleventh semitone of the solfege.

This note lies a chromatic semitone above A and a diatonic semitone below B, thus being enharmonic to Si Bémol or B♭ (B-flat).

When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the A♯ above middle C is approximately 466.164 Hz. See pitch (music) for a discussion of historical variations in frequency.

Designation by octave

Scientific designation	Helmholtz designation	Bilinear music notation	Octave name	Frequency (Hz)
A♯-1	A♯͵͵͵ or ͵͵͵A♯ or AAAA♯	(-uA♯)	Subsubcontra	14.568
A♯0	A♯͵͵ or ͵͵A♯ or AAA♯	(-vA♯)	Subcontra	29.135
A♯1	A♯͵ or ͵A♯ or AA♯	(-wA♯)	Contra	58.270
A♯2	A♯	(-xA♯)	Great	116.541
A♯3	a♯	(-yA♯)	Small	233.082
A♯4	a♯′	(zA♯)	One-lined	466.164
A♯5	a♯′′	(yA♯)	Two-lined	932.328
A♯6	a♯′′′	(xA♯)	Three-lined	1864.655
A♯7	a♯′′′′	(wA♯)	Four-lined	3729.310
A♯8	a♯′′′′′	(vA♯)	Five-lined	7458.620
A♯9	a♯′′′′′′	(uA♯)	Six-lined	14917.240
A♯10	a♯′′′′′′′	(tA♯)	Seven-lined	29834.481

Scales

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♯

See also

• B♭ (musical note)
• Piano key frequencies
• A-sharp major
• A-sharp minor