The musicians weren’t the same Roots band seen regularly on NBC’s “Tonight” show with Jimmy Fallon. They included the Metropolis Ensemble — the conductor Andrew Cyr, a string quartet and four singers — and the jazz pianist D. D. Jackson, who wrote dramatic, somberly dissonant arrangements for the ensemble.

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