In the Upper East Side townhouse that the American Irish Historical Society calls home, a violinist ambled down the stairs while tuning her instrument and a harpist improvised with electronic sounds that came from the walls.

Andrew Cyr and David Bruce talk over the score on stage for “The Firework Maker’s Daughter.”

Discover the origin story that led to an ongoing collaboration between The Roots and Metropolis, and their new studio album, Undun.