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A440 or Concert A is the 440 Hz
Hertz

The hertz is a measure of frequency per unit of time, or the number of list of cycles per second. It is the SI base unit of frequency in the International System of Units , and is used worldwide in both general-purpose and scientific contexts....
 tone that serves as the standard for musical pitch
Pitch (music)

Pitch represents the perceived fundamental frequency of a sound. It is one of the three major auditory system attributes of sounds along with loudness and timbre....
. A440 is the musical note
Note

In music, the term note has two primary meanings: 1) a sign used in musical notation to represent the relative duration and pitch of a sound; and 2) a pitched sound itself....
 A
A (musical note)

La or A is the sixth note of the solf?ge. "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....
 above middle C
Middle C

C or Do is the first note of the fixed-Do solf?ge.In Western music, the expression "Middle C" refers to the musical note "C" located exactly between the two staff of the grand staff and near the top and bottom, respectively, of the bass voice and soprano voices....
 (C4
Piano key frequencies

This is a virtual piano showing the frequencies in cycles per second , of each of the 88 keys on a piano , with the 49th note, the fifth A , tuned to 440 cycles per second ....
).

Prior to the standardization on 440 Hz, many countries and organizations followed the 435 Hz recommendation the Austria
Austria

Austria , officially the Republic of Austria , is a landlocked country in Central Europe. It borders both Germany and the Czech Republic to the north, Slovakia and Hungary to the east, Slovenia and Italy to the south, and Switzerland and Liechtenstein to the west....
n government made in 1885. The American music industry reached their own informal compromise of 440 Hz in 1926, and used it in instrument manufacturing.






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A440 or Concert A is the 440 Hz
Hertz

The hertz is a measure of frequency per unit of time, or the number of list of cycles per second. It is the SI base unit of frequency in the International System of Units , and is used worldwide in both general-purpose and scientific contexts....
 tone that serves as the standard for musical pitch
Pitch (music)

Pitch represents the perceived fundamental frequency of a sound. It is one of the three major auditory system attributes of sounds along with loudness and timbre....
. A440 is the musical note
Note

In music, the term note has two primary meanings: 1) a sign used in musical notation to represent the relative duration and pitch of a sound; and 2) a pitched sound itself....
 A
A (musical note)

La or A is the sixth note of the solf?ge. "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....
 above middle C
Middle C

C or Do is the first note of the fixed-Do solf?ge.In Western music, the expression "Middle C" refers to the musical note "C" located exactly between the two staff of the grand staff and near the top and bottom, respectively, of the bass voice and soprano voices....
 (C4
Piano key frequencies

This is a virtual piano showing the frequencies in cycles per second , of each of the 88 keys on a piano , with the 49th note, the fifth A , tuned to 440 cycles per second ....
).

Prior to the standardization on 440 Hz, many countries and organizations followed the 435 Hz recommendation the Austria
Austria

Austria , officially the Republic of Austria , is a landlocked country in Central Europe. It borders both Germany and the Czech Republic to the north, Slovakia and Hungary to the east, Slovenia and Italy to the south, and Switzerland and Liechtenstein to the west....
n government made in 1885. The American music industry reached their own informal compromise of 440 Hz in 1926, and used it in instrument manufacturing. In 1936, the American Standards Association recommended that the A above middle C be tuned to 440 Hz. This standard was taken up by the International Organization for Standardization
International Organization for Standardization

The International Organization for Standardization , widely known as ISO , is an international standard-setting body composed of representatives from various national standards organizations....
 in 1955 (and was reaffirmed by them in 1975) as ISO 16. Although still not completely, universally accepted, since then it has served as the audio frequency
Frequency

Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency.The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency....
 reference for the calibration of piano
Piano

The piano is a musical instrument played by means of a keyboard instrument. Widely used in Western music for solo performance, ensemble use, chamber music, and accompaniment, the piano is also very popular as an aid to musical composition and rehearsal....
s, violin
Violin

The violin is a Bow string instrument with four strings usually tuned in perfect fifths. It is the smallest and highest-pitched member of the violin family of string instruments, which also includes the viola and cello....
s, and other musical instruments.

See: History of pitch standards in Western music
Pitch (music)

Pitch represents the perceived fundamental frequency of a sound. It is one of the three major auditory system attributes of sounds along with loudness and timbre....
.

See also


  • Pitch (music)
    Pitch (music)

    Pitch represents the perceived fundamental frequency of a sound. It is one of the three major auditory system attributes of sounds along with loudness and timbre....
  • Electronic tuner
    Electronic tuner

    An electronic tuner is a device used by musicians to detect and display the Pitch of notes played on musical instruments. The simplest tuners use LED lights or a needle to indicate approximately whether the pitch of the note played is lower, higher, or approximately equal to the desired pitch....


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  • as described in their catalog