TOPSHOT - This AFP TV video frame grab shows the hologram of Maria Callas singing on stage during an hologram-concert at the Salle Pleyel, in Paris, on November 28, 2018. - Opera diva Maria Callas "returns" to the stage - as a hologram during the show 'Callas - The Hologram Show', which is shown until November 30, 2018 at the Salle Pleyel in Paris, 41 years after the singer's death. (Photo by Natalie HANDEL / AFP)