Gratitudes for the lovely video to Violette13) and av_orange.

The song is performed by the winner of the America's Got Talent Jackie Evancho.
You can find out more about her on facebook.com/jackieevancho, wiki and jackieevancho.com

The video represents the main theme for the "House of the Flying Daggers" by Jan Imou where Takeshi Kaneshiro performed the main role. This music is composed by Shigeru Umebayashi and is called "Lovers".
Also, there is a video about the shooting process of the HOTFD from av_orange:

video gratitudes to FunkSoulBrother3 channel