If Norimune is still looking for a musician Soo Won would gladly help! Soo Won has a haunted shamisen from hakagemachi that allows him to play a few songs when he allows the instrument to possess him.

Miyako will be performing as the mysterious Musician in Red so Norimune could catch Soo Won afterward with the shamisen and ask for his help then? Or we could handwave that Norimune saw the shamisen when he and Soo Won had tea during the blood rain.