If a passage is marked "sostenuto", how should it be played?

When a passage is marked "sostenuto," it instructs the performer to play the music in a sustained manner. This term, which translates from Italian to "sustained," indicates that the notes should be held for their full value without rushing or cutting them short. The intention is to create a smooth and connected sound, allowing the tones to resonate and blend seamlessly. This contrasts with other playing styles, such as detached or staccato, which would involve separation between the notes. The focus for a sostenuto passage is on maintaining a steady, flowing quality that emphasizes the continuity of sound.