Sword Art Online- Opening 1- Crossing Field- HD

What you're eventually hearing is the english version of Amalee's Crossing Field. It is supposedly a Chinese theme song that opens on the first season's episodes of "Sword Art Online". However you can listen to the whole version of the song on this link:

http://www.youtube.com/watch?v=MO60ahwc8FI

improved version:
https://www.youtube.com/watch?v=sP0sR1Hq0vs

Japanese version:
http://www.youtube.com/watch?v=VpcHR_ByuUg