The piano version of a fan-made piece. It's a fan-made theme for the character Asuna from the anime Sword Art Online. It's a very beautiful rendition.
[video=youtube;GWd3xjQy-V4]http://www.youtube.com/watch?feature=player_detailpage&list=FLu_M4Ya1qC0uRWwXppM024g&v=GWd3xjQy-V4[/video]