well i only found Onmyouza and there great. i went to the mono site and the music playing sold me enough. if you guys know anyplaces to get some mp3's let me know!
i wish i would have found some of that concerto moon..they sound interesting
A buddy of mine reommended Loudness, who've been around for a while. I hear Melt Banana is pretty good, too. They actually come to the States for shows, which is nice. They're on tour with Mike Patton's Fantomas.
Loudness have been around more than 20 years
led by the super guitarist Akira Takasaki [influenced by Eddie Van Halen]
they toured in Europe and North America during the 1980s and received very good critics,things looked so bright for them,but the vocal Minoru Nihara left the band in 1988 and things just went downhill
during the 1990s they kept chaning the line-up,only Akira Takasaki stayed in the band throughout those years,the band's style also changed
in 2002,all the original members came back,their music sound very heavy and somehow 'thrashy' now
I checked out a few underground rock bands while I was in Japan that were really good. My favorite was "Kobose". They're influenced by Primus and the vocalist/bassist has a cool, unique style of singing. All three members are incredibly skilled and put on one of the most energetic live shows I've ever seen. They're from Tokyo. Also, for some good straight-up metal, I liked "Eyes" from Nagoya.