A♯ (musical note)

${ \new Staff \with{ \magnifyStaff #3/2 } << \time 2/1 \override Score.TimeSignature #'stencil = ##f { \clef bass ais1_A-sharp \clef treble ais' } >> }$

A♯ (A-sharp; French: la dièse) is the eleventh semitone of the solfège.

This note lies a chromatic semitone above A and a diatonic semitone below B, thus being enharmonic to B♭ (French: si bémol).

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 466.164Hz.^[1] See pitch (music) for a discussion of historical variations in frequency.

Designation by octave

Scientific designation	Helmholtz designation	Octave name	Frequency (Hz)
A♯₋₁	A♯͵͵͵ or ͵͵͵A♯ or AAAA♯	Subsubcontra	14.568
A♯₀	A♯͵͵ or ͵͵A♯ or AAA♯	Subcontra	29.135
A♯₁	A♯͵ or ͵A♯ or AA♯	Contra	58.27
A♯₂	A♯	Great	116.541
A♯₃	a♯	Small	233.082
A♯₄	a♯′	One-lined	466.164
A♯₅	a♯′′	Two-lined	932.328
A♯₆	a♯′′′	Three-lined	1864.655
A♯₇	a♯′′′′	Four-lined	3729.31
A♯₈	a♯′′′′′	Five-lined	7458.62
A♯₉	a♯′′′′′′	Six-lined	14917.24
A♯₁₀	a♯′′′′′′′	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♯

References

^ Suits, B. H. (1998). "Physics of Music Notes – Scales: Just vs Equal Temperament". MTU.edu. Michigan Technological University. Retrieved 5 February 2024.

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[1] Suits, B. H. (1998). "Physics of Music Notes – Scales: Just vs Equal Temperament". MTU.edu. Michigan Technological University. Retrieved 5 February 2024.

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