Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
음악에서 덧줄은 음표의 위치를 표시하는 데 사용됩니다.eumakeseo deotjul-eun eumphoeui wichi-reul pyosi-haneun de sayongdoemnida.In music, a ledger line is used to indicate the position of notes.