Astonishment as hologram, live orchestra put Callas back onstage

Audience members at Paris’s Salle Pleyel respond with astonishment, delight, and — in some cases — disappointment at seeing a hologram of Maria Callas perform some of her most beloved arias. For 90 minutes, a live orchestra accompanies a laser projection of “la divina” in the “Callas in Concert Hologram Tour.”