
In modern musical notation and tuning, an enharmonic equivalent is a note, interval, or key signature that is equivalent to some other note, interval, or key signature but `spelled`, or named differently. Thus, the enharmonic spelling of a written note, interval, or chord is an alternative way to write that note, interval, or chord. For example,.....
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http://en.wikipedia.org/wiki/Enharmonic

• (a.) Alt. of Enharmonical
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http://thinkexist.com/dictionary/meaning/enharmonic/

in the system of equal temperament tuning used on keyboard instruments, two tones that sound the same but are notated (spelled) differently. Pitches ... [4 related articles]
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http://www.britannica.com/eb/a-z/e/32

the relationship between two pitches that represent the same note (i.e. G# and Ab)
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http://www.encyclo.co.uk/local/20596
En`har·mon'ic (ĕn`hȧr*mŏn'ĭk),
En`har*mon'ic*al (-ĭ*k
a l)
adjective [ Greek
'enarmoniko`s ,
'enarmo`nios fitting, accordant;
'en in +
'armoni`a harmony: confer French
enharmonique .]
1. (An...Found on
http://www.encyclo.co.uk/webster/E/43

In ancient music, enharmonic was a kind of musical scale recognised by the ancient Greeks, which consisted of quarter tones and major thirds, and was regarded as the most accurate. In modern music, the term enharmonic pertains to a change of notes to the eye, while, as the same keys are used, the instrument can mark no difference to the ear, as for...
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http://www.probertencyclopaedia.com/browse/VE.HTM

enharmonic, enharmonically Relating to, or involving tones that are identical in pitch but are written differently according to the key in which they occur; such as, C sharp and D flat.
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In music, a harmony capable of alternative interpretations, used as a link between passages of normally unrelated keys. For example, an enharmonic modulation from C sharp to F major plays on the equivalence, in keyboard terms, of the notes E sharp and F
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https://www.encyclo.co.uk/local/21221

having the same pitch in the tempered scale but written in different notation, as G sharp and A flat.
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https://www.infoplease.com/dictionary/enharmonic
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