noun
A symbol in musical notation that temporarily alters the pitch of a note, such as a sharp, flat, or natural sign.
この小節の臨時記号は次の小節線まで有効です。
The accidental in this measure is valid until the next bar line.
楽譜に臨時記号がたくさんあると、演奏が難しくなる。
When there are many accidentals in the score, it becomes difficult to perform.