Check out footage from Coachella 2012. A Snoop Dogg and Dr. Dre performance was started with a holographic performance by none other than Tupac. Being a California native, I've grew up on Tupac's music. This performance was greatly appreciated and only shows the impact Tupac has on pop culture today.
FYI: The first 3D holographic performance of the Gorillaz was done in 2005 for the MTV Awards using a Musion Eyeliner System.