Hello everyone, bumped into a Nico Nico collab video called "Seven Colors of Nico Nico Douga"
At ~7min 40 there's the following insert:
http://www35.zippyshare.com/v/81390732/file.html (make sure it says HD in the top right corner or it sounds bad)
(the file is not copyrighted)
I believe it's an anime opening or similar, if someone recognises, please do tell :)

thanks in advance

That is double lariat by luka :) it's a vocaloid song.

That is double lariat by luka :) it's a vocaloid song.

It is!! Thanks a lot ^.^
sheets here http://www.youtube.com/watch?v=6Jo42QrVBxA