sharp or flat note; non-natural note
In music theory, a note that is not part of the natural scale of the key; i.e., an accidental. Contrasts with 幹音 (natural note).
See also: 幹音
In C major, F sharp is a non-natural note.
Non-natural notes include sharps and flats.
派生 (derivation) + 音 (sound). A straightforward compound describing notes derived from the natural scale.