When The Eternals take the stage at Millenium Park tonight, their band will be ten members strong. They’ll play the Espiritu Zombie Suite, a composition created just for them. While the band’s typical music is already a fascinating and eclectic blend of different styles from punk to jazz, tonight’s performance will be a fresh and especially dynamic experiment for the expanded group.

The Eternals began as a collaboration between Damon Locks and Wayne Montana, previously of Trenchmouth. Monday morning on Eight Forty-Eight, the duo will stop by to chat about the band’s unique sound and how the two conceived of the musical extravaganza that will take place later today.