A (musical note)
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A is a musical note equivalent to 440 Hz in typical A440 tuning. It is the sixth note of La and the tenth semitone of the fixed-do solfège.
Its enharmonic equivalents are BTemplate:Music (B double-flat) and GTemplate:Music (G double-sharp).
"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,[2] 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 standard pianos with 88 keys, and the rarer older 85-key pianos.
Designation by octave
| Scientific designation |
Helmholtz designation |
Octave name |
Frequency (Hz) |
MIDI note number | Sound sample |
|---|---|---|---|---|---|
| A−1 | A,,, or ,,,A or AAAA | Subsubcontra | 13.75 | 9 | |
| A0 | A,, or ,,A or AAA | Subcontra | 27.5 | 21 | |
| A1 | A, or ,A or AA | Contra | 55 | 33 | 55 Sine wave |
| A2 | A | Great | 110 | 45 | 110 Sine wave |
| A3 | a | Small | 220 | 57 | 220 Sine wave |
| A4 | aTemplate:Prime | One-lined | 440 | 69 | 440 Sine wave |
| A5 | aTemplate:PrimeTemplate:Prime | Two-lined | 880 | 81 | 880 Sine wave |
| A6 | aTemplate:PrimeTemplate:PrimeTemplate:Prime | Three-lined | 1760 | 93 | 1760 Sine wave |
| A7 | aTemplate:PrimeTemplate:PrimeTemplate:PrimeTemplate:Prime | Four-lined | 3520 | 105 | |
| A8 | aTemplate:PrimeTemplate:PrimeTemplate:PrimeTemplate:PrimeTemplate:Prime | Five-lined | 7040 | 117 | |
| A9 | aTemplate:PrimeTemplate:PrimeTemplate:PrimeTemplate:PrimeTemplate:PrimeTemplate:Prime | Six-lined | 14080 | N/A | |
| A10 | aTemplate:PrimeTemplate:PrimeTemplate:PrimeTemplate:PrimeTemplate:PrimeTemplate:PrimeTemplate:Prime | Seven-lined | 28160 | N/A |
Scales
Common scales beginning on A
- A major: A B CTemplate:Music D E FTemplate:Music GTemplate:Music A
- A natural minor: A B C D E F G A
- A harmonic minor: A B C D E F GTemplate:Music A
- A melodic minor ascending: A B C D E FTemplate:Music GTemplate:Music A
- A melodic minor descending: A G F E D C B A
Diatonic scales
- A Ionian: A B CTemplate:Music D E FTemplate:Music GTemplate:Music A
- A Dorian: A B C D E FTemplate:Music G A
- A Phrygian: A BTemplate:Music C D E F G A
- A Lydian: A B CTemplate:Music DTemplate:Music E FTemplate:Music GTemplate:Music A
- A Mixolydian: A B CTemplate:Music D E FTemplate:Music G A
- A Aeolian: A B C D E F G A
- A Locrian: A BTemplate:Music C D ETemplate:Music F G A
Jazz melodic minor
- A Ascending melodic minor: A B C D E FTemplate:Music GTemplate:Music A
- A Dorian ♭2: A BTemplate:Music C D E FTemplate:Music G A
- A Lydian augmented: A B CTemplate:Music DTemplate:Music ETemplate:Music FTemplate:Music GTemplate:Music A
- A Lydian dominant: A B CTemplate:Music DTemplate:Music E FTemplate:Music G A
- A Mixolydian ♭6: A B CTemplate:Music D E F G A
- A Locrian ♮2: A B C D ETemplate:Music F G A
- A Altered: A BTemplate:Music C DTemplate:Music ETemplate:Music F G A
See also
References
External links
- Standard Pitch or Concert Pitch for Pianos by Barrie Heaton