If you want info, just google the band. google.co.jp would probably work better for japanese bands. Some bands have sample music/videos in their sites. I also find youtube a great way to check out a band. Search in english, and japanese. If you like vk, there's lots of sites dedicated to it. If you want some underground bands, audioleaf is a great japanese site.for english info, just look in any j-music related forum. wikipedia or wiki.theppn has info on lots of japanese artists. Want to know some lesser known mostly non-vk bands, check out IiNihon(link in a sticky in this forum). Though it's not updated regularly >_>Jpopsuki is the best tracker there is for Japanese music. If they don't have it, search on some P2P program. If that doesn't work, just ask around. I recommend soulseek as a good p2p where you can search for music, and ask people in a chatroom. J-rock is such a broad catagory that I can't really give you any details. If you really want to find different bands to listen to, you can't really just look in a couple of places.The best resource though, is actual people, so if someone mentions a band you'd be interested in, but can't find any info yourself, ask about it.
(2006.11.05) 桃色のキリン
Road of Major to disbandRock band Road of Major revealed on Monday that they plan to break up. According to the announcement, the four members have been working together despite their differing tastes, and now they want to return to their original paths as individuals. However, they suggested that there is a possibility of the band reuniting in the future.The popular band formed in 2002 as part of a talent search on TV Tokyo's audition show, "Hamaraja."
Miyu is back.http://www.sanspo.com/geino/top/gt200706/gt2007063001.html
Anything goes.