A (musical note)

A (musical note)

A440 About this sound Play  .

La or A is the sixth note of the fixed-Do solfège. Its enharmonic equivalent Bdouble flat (or Heses) is a diatonic semitone above 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 equals a lower pitch.

By an international treaty signed in 1939, modern pitch is standardized at 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 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 1
  • Scales 2
    • Common scales beginning on A 2.1
    • Diatonic scales 2.2
    • Jazz Melodic Minor 2.3
  • See also 3
  • External links 4

Designation by octave

Scientific designation Helmholtz designation Bilinear music notation Octave name Frequency (Hz) Sound sample
A−1 A͵͵͵ or ͵͵͵A or AAAA (-uA) Subsubcontra 13.75
A0 A͵͵ or ͵͵A or AAA (-vA) Subcontra 27.50
A1 A͵ or ͵A or AA (-wA) Contra 55
55 Sine wave
A2 A (-xA) Great 110
110 Sine wave
A3 a (-yA) Small 220
220 Sine wave
A4 a′ (zA) One-lined 440
440 Sine wave
A5 a′′ (yA) Two-lined 880
880 Sine wave
A6 a′′′ (xA) Three-lined 1760
1760 Sine wave
A7 a′′′′ (wA) Four-lined 3520
A8 a′′′′′ (vA) Five-lined 7040
A9 a′′′′′′ (uA) Six-lined 14080
A10 a′′′′′′′ (tA) Seven-lined 28160


Common scales beginning on A

Diatonic scales

Jazz Melodic Minor

See also

External links

  • Standard Pitch or Concert Pitch for Pianos by Barrie Heaton
  • Virginia Tech Music Dictionary: A