The term 'UPBEAT' in music refers to the second beat of a measure, which is usually the stronger and more accented beat. The term 'arsis' is derived from the Greek word for 'lifting, ' and it is used to refer to the first beat of a measure, which is usually the weaker and less accented beat. In musical notation, the arsis is represented by an upward stem, while the UPBEAT is represented by a downward stem.