Just found it from Lantis videos on youtube. That video would be featured three artist on the same stage.
true tears x hanasaku iroha x TARITARI
The most artist I love are true tears and TARITARI. Well, I always watch that anime whenever Im able to watch. The footage on video told that BD live video will be produce in December 25th, 2013. So, let see if the videos is available at store.
But the most preferedable is eufonius. I really like their song! eufonius is da best! >.<