Rurutia isn't really a known J-pop artist, though I believe she been in the business since 2000...I think. But she never appears in the public eye. [Which is boosted my admiration towards her. @_@] Her style is quite different from many musicians. It's calm, soothing, melancholy. Her vocals are not powerful, instead it's wispy and breathy. I love all of Ruruita's songs, from the angry-sounding 'Hallelujah' to the inspiring 'Lost Butterfly'. She breathes new life into the J-pop genre.

Lost Butterfly
Shine
Tr?umerei
Itoshigo Yo

You can find more of Rurutia on Youtube. I used to have her full discography. Unfortunately...it got deleted. *sobs*