{ \new Staff \with{ \magnifyStaff #3/2 } << \time 2/1 \override Score.TimeSignature #'stencil = ##f { \clef bass a1_A \clef treble a'_A } >> }

A or La is the sixth note and the tenth semitone of the fixed-do solfège.

Its enharmonic equivalents are B♭♭ (B double flat) which is a diatonic semitone above A♭ and Gdouble sharp (G double sharp) which is a diatonic semitone below A♯.

"A" is generally used as a standard for tuning. When the orchestra tunes, the oboe plays an "A" and the rest of the instruments tune to match that pitch. Every string instrument in the orchestra has an A string, from which each player can tune the rest of their instrument.

"A" is also used in combination with a number (e.g. A-440) to label the pitch standard. The number designates the frequency in hertz. A lower number indicates a lower pitch.

The International Standards Organization (ISO) has standardized the pitch at A-440.[1] However, tuning has varied over time, geographical region, or instrument maker. In 17th-century Europe, tunings ranged from about A-374 to A-403, approximately two to three semitones below A-440. Historical examples exist of instruments, tuning forks, or standards ranging from A-309 to A-455.3, a difference of almost six semitones. Although the official standard today is A-440, some orchestral groups and chamber groups prefer to tune a little higher, at A-442 or even A-444. Baroque pitch is usually cited as A-415, which is a semitone lower than modern pitch.

A0 is the lowest note on the standard piano. The octaves follow A1, A2, etc. A7 is a few pitches lower than C8, the highest note on the standard piano. The note "A" is not considered to be a certain milestone or mark to hit with voice as, for example, Tenor C is, but it can be extremely demanding in certain octaves.

Designation by octave

Scientific
designation		 Helmholtz
designation		 Octave
name		 Frequency
(Hz)		 Sound sample
A−1A͵͵͵ or ͵͵͵A or AAAASubsubcontra13.75
A0A͵͵ or ͵͵A or AAASubcontra27.5
A1A͵ or ͵A or AAContra55
A2AGreat110
A3aSmall220
A4a′One-lined440
A5a′′Two-lined880
A6a′′′Three-lined1760
A7a′′′′Four-lined3520
A8a′′′′′Five-lined7040
A9a′′′′′′Six-lined14080
A10a′′′′′′′Seven-lined28160

Scales

Common scales beginning on A

Diatonic scales

Jazz melodic minor

See also

References

  1. ↑ "ISO 16:1975 Acoustics - Standard Tuning Frequency". International Standards Organization. Retrieved 10 December 2019.
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