Yay, these threads are always amusing. :D Yeah, love Japanese music here, it's about the only thing I really listen to these days. Hmm, don't think I'll list any of the usual stuff this time around since I've been into tons of new bands lately.
I didn't really like them at first, but Shuuchishin is a pretty amusing group, despite just being one big gimmick. I've pretty much always been in love with GReeeeN, but I don't think I've ever mentioned them. KCB is also a really great band, their first two singles, A RIZE and Natsukoi, are awesome. I also like The Waffles and DUSTZ, but those are indie bands, so I wouldn't expect too many people to know them.