In music theory, the relationship between notes or pitches that are enharmonically equivalent, sounding identical but having different names and functions in different keys.
From Greek 'epi' (upon) + 'harmonia' (harmony). This theoretical term developed as musicians and composers increasingly encountered situations where the same pitch needed different names depending on the musical context and key signature.
Epharmony is why sheet music can look completely different even when the piece sounds identical—a composer might write D-flat in one key to make the key signature clearer, even though C-sharp would produce the exact same sound.
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