As far as Japanese music is concerned, I listen to ''Burning Spirits'' style of Japanese hardcore. Bands like Forward, Paintbox and Blowback. It would definitely fall under the category of ''And now for something completely different''.
Here's a little bit of Paintbox from their newest album. I think they're the most digestible of the lot since they experiment with more mundane music styles.
http://www.youtube.com/watch?v=bQtJZHDPNAs (unusual song for them, it sounds like J-pop with a tad of 'normal' Paintbox thrown in the middle)
http://www.youtube.com/watch?v=X1uvrfmRvL8 (a more typical song with classic rock influence)
