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A-flat (musical note)

Musical note

Summary

Musical note

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A (A-flat; also called la bémol) is the ninth semitone of the solfège.

It lies a diatonic semitone above G and a chromatic semitone below A, thus being enharmonic to G, even though in some musical tunings, A will have a different sounding pitch than G.

When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the A above middle C (or A4) is approximately 415.305 Hz. See pitch (music) for a discussion of historical variations in frequency.

The notes A and G are the only notes to have only one enharmonic, since they cannot be reached in any other way by a single or double sharp or a single or double flat from any of the seven white notes.

Designation by octave

Scientific designation	Helmholtz designation	Octave name	MIDI note number
A−1	A͵͵͵ or ͵͵͵A or AAAA	Octocontra	8
A0	A͵͵ or ͵͵A or AAA	Subcontra	20
A1	A͵ or ͵A or AA	Contra	32
A2	A	Great	44
A3	a	Small	56
A4	a	One-lined	68
A5	a	Two-lined	80
A6	a	Three-lined	92
A7	a	Four-lined	104
A8	a	Five-lined	116
A9	a	Six-lined	N/A
A10	a	Seven-lined	N/A

Scales

Common scales beginning on A{{music|flat}}

A major: A B C D E F G A
A natural minor: A B C D E F G A
A harmonic minor: A B C D E F G A
A melodic minor ascending: A B C D E F G A
A melodic minor descending: A G F E D C B A

[[Diatonic scale]]s

A Ionian: A B C D E F G A
A Dorian: A B C D E F G A
A Phrygian: A B C D E F G A
A Lydian: A B C D E F G A
A Mixolydian: A B C D E F G A
A Aeolian: A B C D E F G A
A Locrian: A B C D E F G A

[[Jazz scale#Modes of the melodic minor scale|Jazz melodic minor]]

A ascending melodic minor: A B C D E F G A
A Dorian ♭2: A B C D E F G A
A Lydian augmented: A B C D E F G A
A Lydian dominant: A B C D E F G A
A Mixolydian ♭6: A B C D E F G A
A Locrian ♮2: A B C D E F G A
A altered: A B C D E F G A

References

Suits, B. H.. (1998). "Physics of Music Notes - Scales: Just vs Equal Temperament". Michigan Technological University.

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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