Britannica Sources used in this answer

What instrument accompanies a pansori singer?

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A pansori singer is accompanied by a single drummer, known as a kosu. The drummer plays a buk, which is a double-headed barrel drum.12

Throughout the performance, the drummer provides the necessary rhythmic foundation for the singer and marks phrases using specific rhythmic patterns. In addition to playing the drum, the kosu contributes vocal interjections known as ch’uimsae to support the narrative. This creates a dynamic, improvised interaction between the vocalist and the drummer as the epic story unfolds.21