Mine are UVERworld, FLOW, YUI and Home Made Kozaku ^^ Others that are pretty good: -AAA (Triple A or Attack All Around) -Tomoko Kawase (Tommy Heavenly, etc...) -Maximum The Hormone
The Back Horn Asian Kung-Fu Generation Acidman The Pillows Showtaro Morikubo (not a band but an artist)
Monoral is great. They used their song "kiri" in the intro of Ergo Proxy. I was surprised when I first heard them. They sing in English, and they sound very western, none of that engrish type stuff from other english singing Japanese Bands.
The ones i like,(* means my favorites and recommended to listen to ) LiSA* Home Made Kozaku* Uverworld* Tommy Heavenly Aoi Eir* Supercell* Iku Kotoko* Marble L'arc-en-ciel* Hearts Grow YUI Rookiez is Punk'd*