The title, Genjo, was the name for biwa (Japanese lute) which was regularly used by Emperor Murakami who plays it repeatedly in the song; however, music is abstracted on the stage and instruments are not actually played except in special renditions.
題名の絃上は村上天皇愛用の琵琶の名称であり、曲中でも度々琵琶を演奏している場面があるが、舞台の上では演奏は抽象化されており、特殊な演出を除いて実際に弾くことはない。