hey, I'm a bit new to the whole j-pop scene, but the songs that I've caught from the anime I watch are killer. I like:

Haruka Kanata from Naruto
Arigatou from bleach (end song)
2nd Ending song from samurai champloo - I really dig this one !
and of course the Gantz theme song - super shooter.

I've sort of checked out the rest of the other artists songs, but only Rip SLyme seems to have a bunch of other good songs - galaxy, dandelion, one etc. I dig their crazy style ! Do you guys have any other recommendations ? Any other good songs from the artists above ?