Japan is the world's second-largest music market but because of the language barrier, most of us have very little idea of what's going on in that country.
Take the case of Hatsune Miku. While we're all agog at the Tupac trick seen at Coachella last weekend, Japanese fans have been grooving to her for years. It's not uncommon for 25,000 people to pay to see one of her concerts in an arena or stadium. When she appears, eveyone loses their shit.
If you're wondering where the whole Tupac-is-back technology can go, you've just seen it.