# A (音名)

A或者la唱名的第六個音。A是用來調音的，當管弦樂團調音時，會叫雙簧管吹A，其他樂器則聽這音來調音；中樂團則是以的標準音調音。

A0鋼琴鍵盤上最低的音。而A7和C8（鋼琴鍵盤上最高的音）很接近。

## 十二平均律

C 261.626 ${\displaystyle {\begin{smallmatrix}{\frac {440}{{\sqrt[{4}]{2}}^{3}}}\end{smallmatrix}}}$  E 329.628 ${\displaystyle {\begin{smallmatrix}{\frac {440}{{\sqrt[{12}]{2}}^{5}}}\end{smallmatrix}}}$  G 415.305 ${\displaystyle {\begin{smallmatrix}{\frac {440}{\sqrt[{12}]{2}}}\end{smallmatrix}}}$
C 277.183 ${\displaystyle {\begin{smallmatrix}{\frac {440}{{\sqrt[{3}]{2}}^{2}}}\end{smallmatrix}}}$  F 349.228 ${\displaystyle {\begin{smallmatrix}{\frac {440}{\sqrt[{3}]{2}}}\end{smallmatrix}}}$  A 440 440
D 293.665 ${\displaystyle {\begin{smallmatrix}{\frac {440}{{\sqrt[{12}]{2}}^{7}}}\end{smallmatrix}}}$  F 369.994 ${\displaystyle {\begin{smallmatrix}{\frac {440}{\sqrt[{4}]{2}}}\end{smallmatrix}}}$  A 466.164 ${\displaystyle {\begin{smallmatrix}440{\sqrt[{12}]{2}}\end{smallmatrix}}}$
D 311.127 ${\displaystyle {\begin{smallmatrix}{\frac {440}{\sqrt[{2}]{2}}}\end{smallmatrix}}}$  G 391.995 ${\displaystyle {\begin{smallmatrix}{\frac {440}{\sqrt[{6}]{2}}}\end{smallmatrix}}}$  B 493.883 ${\displaystyle {\begin{smallmatrix}440{\sqrt[{6}]{2}}\end{smallmatrix}}}$

## 不同八度上的A音

A9 a′′′′′′ 14080
A8 a′′′′′ 7040
A7 a′′′′ 3520
A6 a′′′ 1760
A5 a′′ 880
A4 a′ 440
A3 a 220
A2 A 110
A1 A͵或͵A 55
A0 A͵͵或͵͵A 27.50
A−1 A͵͵͵或͵͵͵A 13.75

A在十二律中对应南吕