We already have a thread for suggestions.
http://www.japanforum.com/forum/japa...avourites.html
to answer your question, the best JRock band is X JAPAN.
They hold the record for selling out the Tokyo Dome three nights in a row in 1992. And after a 10 year breakup, they did it again, having 200,000 ticket requests on a PRE-SALE in under 2 hours..
what more needs to be said...