Referring to notes that sound the same pitch but are spelled differently, such as F# and Gb. These equivalent pitches allow composers to change keys smoothly or create harmonic ambiguity.
From Greek enharmonikos, combining en- 'in' and harmonia 'harmony.' Originally referred to ancient Greek quarter-tone intervals, but evolved in Western music theory to describe pitch equivalencies in equal temperament.
Enharmonic equivalents are like musical optical illusions - the same sound can have completely different meanings depending on context, which is why a Db major chord can magically transform into a C# major chord in Chopin's hands!
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