What is the meaning of "sostenuto" in a musical context?

In a musical context, "sostenuto" means "sustained." This term is often used to instruct musicians to hold a note or chord for its full value, creating a smooth and connected sound. It emphasizes the importance of maintaining the sound rather than allowing it to decay quickly. This technique can add expressiveness and depth to a performance, enhancing the musical line and giving it a lyrical quality.

Understanding this term is essential for interpreters of music, as it helps guide their phrasing and dynamics in a way that aligns with the intended emotional impact of the piece. In contrast, the other choices refer to different styles or moods in music: being lively, quickly, or with sadness, which do not align with the fundamental meaning of sostenuto.