You're not alone Antares, I dig shonen Knife as well.
Cibo Matto is OK, a little unpredictable.
I however am a sucker for anybody from the Hello! Project.
Morning Musume, Mini Moni, W, XYZ, et al.
I actually imported Mini Moni's movie, the Great Cake Adventure, even though I can't understand more than a couple of words. :oops:
the funny thing is I can't stand American pop music nowadays but the J-Pop (especially the videos) just grabs hold of my brain and won't let go.
Unfortunately I've never gotten into the j-rockers, no offense.