Anime helps a lot to promote songs and artists. But I also think that being a Yuki Kajiura's band is one of the big reason that the girls are doing well too. She is a solid value.
There is a new song called
into the world that is the theme of Rekishi Hiwa Historia. You can hear a preview here :
http://kalafinafanblog.blogspot.be/2...-historia.html