Mezzo-piano is a musical term that indicates a moderate level of softness in sound. It is often abbreviated as "mp" in sheet music. Musicians use this dynamic marking to create a gentle and expressive atmosphere, allowing for a contrast with louder passages. In orchestral and choral music, mezzo-piano helps to shape the overall dynamics of a piece. Composers may instruct performers to play or sing at this level to convey emotion or to highlight specific sections. Understanding mezzo-piano is essential for musicians to interpret and perform music accurately.