So for those who didn't know, this video here is the most popular concert video on youtube!!! No kidding, in just like 12 days it got more than 9 million views!!!!! WOW! Anime is taking over the world... and vocaloids in this case. :P

This is the concert from Tokyo, but there was one during the Anime expo this year as well as some other ones in other countries too. You can all find them and other songs from the concert there in the description of that youtube video.
~ So go there and enjoy in them.. if you can! >:)

EDIT:

These people here post many kinds of videos on youtube (and they are "quite" popular and good) and one of them are Kids react. Most people watching them wanted that they react to Miku's concert. NOW here is the interesting thing. While watching, the Fine brothers actually became fans of Miku and want to know more about vocaloids. xD That's SO awesome!! :D
Watch the video to see the reaction.^^