Any good J-Pop bands atau artists for beginners?

I've been a diehard anime fan for a long time now so I sort of gained interest in Japanese musik too. Really, I've only been listening to Kyary Pamyu Pamyu and VOCALOID, and I'd really like to try branching out my interests, so any suggestions? I'm a pretty big fan of musik with a beat, techno music, dubstep music, basically anything that gets anda pumped, but I'd be willing to try other things!