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I take for granted that in the not so distant future well'see dead actors/musicians replicas performing alone or along real ones. Having John Lennon and Kurt Cobain perform together or John Wayne himself commanding the USS Enterprise (the starship, not the carrier) is just a few years and some lawyers away. Dead star franchises will probably love that though, so the incentive to perfection the technology will very likely bring us to a point where almost all artists will be machine generated because they cost a fraction of real ones.