A dress rehearsal for the Whitney Houston hologram tour, which opens tonight at City Hall in Sheffield, before embarking on a international tour. Photo

From: Photo Coverage: AN EVENING WITH WHITNEY Hologram Concert Opens at Harrah's Las Vegas

'I wish you could have seen (fill in the blank) perform…what an experience!” Have you ever said that to a younger person?  Well, now technology and artistry have combined to enable music lovers in some way to revel in the greatness of an entertainer who is no longer with us.