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I think this is inevitable for dead celebrities, but I hadn't yet considered the possibility of doing this with still living celebrities. Personally I'd say there's a big difference between watching an artist live and watching a pre-recorded hologram. Theatre versus film comes to mind as a comparison. The technology is still in its infancy though. In not too many years the holograms will no longer be pre-recorded, but will be able to respond to the audience, even take requests and improvise during the concert.