Ooooooooooh, yay, I love this thread!
The first one that comes to mind is Kokia. I adore almost all of her songs. On top of her beautiful singing voice, her songs are so...I dunno, unique. It has such a wide range of emotions behind it, and doesn't seem to stick to any sort of pattern. The song that introduced me to her music was Transparent, one of my favorites of all time. *goes off to listen to Kokia*
Also, FictionJunction. Parallel Hearts comes to mind.
I want to say Kalafina, but I find that I actually dislike more of their songs than I like.
Touhou? Does that count as an artist? I dunno, but drill got me into that music and I enjoy it a lot. Good stuff.
In my search for Japanese Christian music, I discovered Daisuke Yokoyama awhile back, and I really enjoy his music. A lot.
He hath shewed thee, O man, what is good; and what doth the Lord require of thee, but to do justly, and to love mercy, and to walk humbly with thy God? -Micah 6:8 KJV
They have shewed thee, O teen, what is good; and what doth the world require of thee, but to fit in, be wealthy, have good looks, and be rebellious? -Peer Pressure 1:1
"I hate milk; it's like drinking vomit." -Edward Elric and me.
ClaecElric4God in regards to Wolfsong - You're the coolness scraped off the top of this morning's ice cream, after being pulled out of a beautiful summer day!