What term is used for a sudden stop of sound in music?

The term for a sudden stop of sound in music is known as "sforzando." This term indicates a sudden, strong emphasis on a note or chord, which can create the effect of a sharp or unexpected pause in the sound. While it suggests a powerful articulation, it can also imply a dramatic point in the music where the sound essentially halts momentarily, giving the piece a dynamic contrast.

In contrast, the other terms provided do not refer to a sudden stop. "Piano" means to play softly and does not convey any abruptness. "Legato" refers to smooth, connected notes without breaks, emphasizing continuity rather than suddenness. "Staccato" denotes detached notes, marked by a crisp and short articulation, but it does not imply a complete stop. Each of these terms helps define different aspects of musical expression, but "sforzando" specifically captures the essence of a sudden halt or dramatic emphasis in sound.