I must say this is quite a cool move on his part. Bringing her back to life and introducing his fans to the classic songs.
But of course he wasn't the first one to do it.
In 2012, Tupac Shakur was also brought back to life performing with Snoop Dogg at Coachella 2012
Hong Kong band Beyond also brought back their late lead singer Wong Kar Kui in 2003 to sing a song that he wrote before he passed away.
There were probably more that was being done, but a few people that I would like to see brought back to "life" would be Leslie Chueng, Cliff Burton from Metallica, Johnny Cash, Freddie Mercury, John Lennon among others. Some may argue its not "original" and not real enough. But the idea of using modern technology to have them come on stage and sing is, to me, amazing.