The first time I heard of this (and one of the examples in the article) was Snoop Dogg performing live at a festival, with a hologram of Tupac. Snoop was the dr

The first time I heard of this (and one of the examples in the article) was Snoop Dogg performing live at a festival, with a hologram of Tupac. Snoop was the draw, Tupac was a surprise, and it went over very well. Also, "live concerts" with lip-synced performances seem to be relatively common, for whatever reasons. The audio is pre-recorded in this case, as well as with a solo, dead "live performer". Doesn't seem like a huge difference to me.