See-Saw- one of the most prolific bands i've ever encountered, i seem to find the band and the lead singer, Yuki Kaijura, everywhere.
Takanori Make Revolution: TM Revolution or TMR for most, they rock so hard its amazing! and the music videos are so epic yet strange it makes your brain implode, lead singer fighting grim reapers in a sewer with an old-school ray-gun wearing a silver Lycra jumpsuit, guyliner and his crazy visual kei hair.
Round Table- Openings to Chobits, .hack twilight and DieBuster, you can't really beat that spread, just try not feeling bibbly happy listening to let Me be with you or Groovin' magic.
Rie Tanaka- Voice of Chii and Lacus Clyne, can't do much better than that.
Maximum the Hormone- i figure everyone already knows them, but i thought i'd throw them in.
Pillows- all of FLCL, and yes neko i know you hate that series but the music is amazing!
i'd also suggest Ali Project, their mixture in music is awesome, creepy yet full, its like being on a roller coaster inside a house of horror.
Lotus Juice- j-rap/rock, check it out. [i have the CD, i could bring it to Animanga if you ask me]
Taku Iwasaki- Libera me from Hell is one of the best songs i ever heard.
well there's a small novel's worth of suggestions.
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Kira = Cuteness.

Remember kids: if you touch Lacus Kira will beat you to death with meteors.
"If something truly was a problem you'd take the actions needed to change it."
-my personal motto