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[[Fasciculus:NotesA.png||thumbnail|300px|Soni A in ambabus clavibus.]]
 
'''La''' vel '''A''' est sexta [[Tonus|nota musica]] usitatae pronuntiationis notatorum sonorum. Congruit ad suum enharmonicum tonum B𝄫, distantem unum diatonicum semitonium a tono A♯. ''A'' tono utuntur symphoniaci ratione concinendi in concentibus. Cum orchestrae est consonantia constituenda, tibia recentioris musicae fistulator principio canit hoc "A", deinde reliqua instrumenta musica consonanda ad tonum comprehendendum.
 
Saepissime '''A''' [[tonus]] fixus vel prototypus in [[orchestra|orchestris]] inter civitates habetur, cum [[sonus]] 440 [[Hertz|Hz]] praedesignata, ex qua [[musicus|musici]] sua [[instrumentum musicum|instrumenta]] obtemperent. Haec frequentia notatur "A" in fundo imaginis ad dextram positae. Recenter mores usque in mundo hanc frequentiam auxerunt ad 442 Hz aut re vera 444 Hz. [[Aetas Baroca|Aetate Baroca]], frequentia circa 415 Hz habebatur, prope [[semisonus|semisonum]] sub 440. Factiones quaedam conmovent{{dubsig}} ut solitus sonus ad 415 Hz denuo decrescat. [[Mathematica|Mathematici]] quidam scriptis de musica fontibus ut [[Leibniz]] et alii postulant rationibus mathematicis C04 melius esse ad 256 Hz. Cum A est prope 440 Hz, C est circa 262 Hz.
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* [[B molle (sonus)|B♭]] minus harmonicum
* [[B (sonus)|B]] minor, et minus melodicum
 
<!--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 equals a lower pitch.
 
By an international treaty signed in 1939{{Citation needed|date=December 2012}}, modern pitch is standardized at [[A440 (pitch standard)|A-440]]. 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 [[semitone]]s below A-440. Historical examples exist of instruments, tuning forks, or standards ranging from A-309 to A-455.3{{Citation needed|date=April 2010}}, 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 [[eighth octave C|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 [[octave]]s.
 
==Designation by octave==
{|class="wikitable"
![[Scientific pitch notation|Scientific]] designation
![[Helmholtz pitch notation|Helmholtz]] designation
!Octave name
!Standard frequency (Hz)
!Sound sample
|-
|A<sub>&minus;1</sub>
|A͵͵͵ or ͵͵͵A
|Subsubcontra
|13.75
|
|-
|A<sub>0</sub>
|A͵͵ or ͵͵A
|Subcontra
|27.50
|
|-
|A<sub>1</sub>
|A͵ or ͵A
|Contra
|55
|[[File:55 Sine wave.ogg|55 Sine wave]]
|-
|A<sub>2</sub>
|A
|Great
|110
|[[File:110 Sine wave.ogg|110 Sine wave]]
|-
|A<sub>3</sub>
|a
|Small
|220
|[[File:220 Sine wave.ogg|220 Sine wave]]
|-
|A<sub>4</sub>
|a&prime;
|One-lined
|440
|[[File:440 Sine wave.ogg|440 Sine wave]]
|-
|A<sub>5</sub>
|a&prime;&prime;
|Two-lined
|880
|[[File:880 Sine wave.ogg|880 Sine wave]]
|-
|A<sub>6</sub>
|a&prime;&prime;&prime;
|Three-lined
|1760
|[[File:1760 Sine wave.ogg|1760 Sine wave]]
|-
|A<sub>7</sub>
|a&prime;&prime;&prime;&prime;
|Four-lined
|3520
|
|-
|A<sub>8</sub>
|a&prime;&prime;&prime;&prime;&prime;
|Five-lined
|7040
|
|-
|A<sub>9</sub>
|a&prime;&prime;&prime;&prime;&prime;&prime;
|Six-lined
|14080
|
|}
 
==Common scales beginning on A==
*[[A major|A Major]]: A B C{{music|#}} D E F{{music|#}} G{{music|#}} A
*A Natural Minor: A B C D E F G A
*A Harmonic Minor: A B C D E F G{{music|#}} A
*A Melodic Minor Ascending: A B C D E F{{music|#}} G{{music|#}} A
*A Melodic Minor Descending: A G F E D C B A
*A [[Dorian mode|Dorian]]: A B C D E F{{music|#}} G A
 
==See also==
*[[A major]]
*[[A minor]]
 
==External links==
*[http://www.uk-piano.org/history/pitch.html Standard Pitch or Concert Pitch for Pianos] by Barrie Heaton
*[http://www.music.vt.edu/musicdictionary/texta/A.html Virginia Tech Music Dictionary: A]
 
<br>
{{Semitones}}
 
{{DEFAULTSORT:A (Musical Note)}}
[[Category:Musical notes]]
 
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== Vide etiam ==