서주 is a traditional Korean musical form that serves as an introduction to a performance, particularly in genres like 판소리 and 가야금. It sets the mood and prepares the audience for the main event, often featuring expressive melodies and rhythms. Typically performed by a solo musician, 서주 showcases the artist's skill and emotional depth. The piece may include improvisation, allowing the performer to convey personal feelings and connect with the audience. This introductory style is essential in Korean music, highlighting the cultural significance of storytelling and emotional expression.