Tupac died in 1996, three years before the first Coachella festival took place, but that didn't stop him--or at least his bizarrely lifelike 3D image--from joining Dr. Dre onstage during Dre's much-hyped festival finale this year. Call it better gigging through technology: About halfway through Dre's 70-minute set, what appeared to be an actual shirtless Tupac appeared onstage, greeted the crowd with "What up, Coachella?"--and then traded rhymes with Dre's co-billed Coachella partner, the flesh-and-blood Snoop Dogg, on "Come With Me," "Hail Mary," and "Gangsta Party." Concertgoers at first seemed confused--the audience momentarily grew abnormally silent--and that confusion only increased when Tupac suddenly vaporized and vanished from the stage as quickly as he had materialized. All eyez were on him, so to speak, and then, POOF--'Pac was gone.