I can't come up with a list of 10 artists, since there aren't 10 artists / groups who have really done anything that great (IMO) this year. So here's my top 3!
1. Namie Amuro
I love everything Namie releases, and I've loved her ever since think of me came out. She's my all time favorite, and always will be! <3
2. alan
alan has had really great songs, and I like just about every one of them that she's released. Nothing else to really say...other than: I also love her single covers!
3. Kuroki Meisa
She released one of my favorite songs of the year! So I think she deserves to be on my list =)
The End!