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Holograms and music
When opera great Maria Callas died in 1977, fans were heartbroken. So they might be shocked to learn that Callas - or rather a projected representation of her - is going on tour this spring with a 60-piece orchestra. Her return is brought to you by what's being called a hologram. Callas and other iconic performers, like Roy Orbison, aren't the only ones being presented in this remarkable new technology; political figures are also hitting the campaign trail via live hologram. David Pogue reports on how holograms are reshaping not just pop culture but history itself, pop culture