Title: Final Fantasy XIII Battle Theme
Composer: ???
Instrument: Violin

I looked on that website VGMusic.com. It does not have it.
Specifics: Just the violin that plays in the background at the beginning, then the solo, and so forth.

Title: Final Fantasy XIII Battle Theme
Composer: ???
Instrument: Violin

I looked on that website VGMusic.com. It does not have it.
Specifics: Just the violin that plays in the background at the beginning, then the solo, and so forth.

You can use the melody line of the piano version :
http://ninjapumped.byethost12.com/main//
Music 楽譜 -> Final Fantasy (series) ファイナルファンタジー -> Blinded by Light 閃光 (Battle Theme) (XIII) (http://www.youtube.com/watch?v=FUACJYfMRTo) Piano Sheets - Video

You should also check this youtube vid, it's good.