I'm pretty big into J-Rock (weird, I know haha), ranging from hard to sweet.
Some examples (I'll put Eng sub of them for those who are interested in listening, although some are in English):
The Gazette-
http://www.youtube.com/watch?v=iGgCSSdIyrU (Red)
http://www.youtube.com/watch?v=emJwa2CiD48 (Guren)
http://www.youtube.com/watch?v=hA1vKUJnOg4 (Uncertain Sense)
http://www.youtube.com/watch?v=dZZGeCNa_5Y (The Invisible Wall)
Alice Nine.-
http://www.youtube.com/watch?v=8Onk5S-p_fU (White Prayer)
http://www.youtube.com/watch?v=36TDzZj7liA (Velvet)
http://www.youtube.com/watch?v=KDYuHbuzO9s (Q)
http://www.youtube.com/watch?v=pZoVl...eature=related (Shunkashuutou)
Gackt-
http://www.youtube.com/watch?v=BqvZU...eature=related (Last Song)
http://www.youtube.com/watch?v=AUT2TEnZl5g (Lost Angels)
http://www.youtube.com/watch?v=aeg1U8Gv8fk (Flower)
I really feel like a lot of these songs have meaning to them, and if it's a little childish, I like to reminisce and sometimes tear up while listening to these songs.