The Orchestra of New Spain specializes in reviving long-lost music. Founder Grover Wilkins and his ensemble have freed a string of neglected Spanish-baroque works from the prison of the library shelves, and on Feb. 21 and 22, the group will give a belated U.S. premiere to a 300-year-old tale of passion among gods and mortals.

Six-year-old Jan Lucca’s facial expressions mirror the activity in front of him: Staring intently at the stage, his eyes widen at exciting moments. He clasps his hands together against his chest during the suspenseful ones. He swings his legs from the chair and his mom smiles from the seat next to him. It’s his first opera.