The tiny figure in white and black in front of the Budokan was my boyfriend at the time, now, husband. It's the only time I'll put his "face" on the blog. ;-)
I didn't go to many concerts in Japan, so my observations may be inaccurate (or outdated), but one of the things I did experience when I went to them was that people stayed in their seats. One of the things I hated when I went to concerts in the U.S. was that the second the show started, people stood up and that forced everyone else to do so as well. I don't know about you, but I am not a fan of spending two hours on my feet when I paid a fair bit of money for a seat. I realize that concerts are exciting experiences, and people may like to "dance", but the truth is that there is little room for people to move around anyway if they don't want to be bumping into the person next to them. In Japan, where the seats were even tinier and closer together, perhaps they knew that standing and jumping around for the duration was just going to put everyone out.
I will miss the fact that people tend to remain seated when they go to rock concerts.