I played "unravel" the OP from "Tokyo Ghoul" by Violin!
Please share this video to your friends on twitter, Facebook, or other SNS, if you like!
*Information for Sheet music*
Now sheet music is available, not expensive!
There are some sheet musics of anime song, please see two links below;
http://www.dojinongaku.com/contents/group_profile.php?grid=1960
آی-ویدئو