No Strings On Me - Age of Ultron

I heard this creepy version of the song and want it for my 2015 Halloween playlist, I have not found the artist but only know its the background music to the Age of Ultron previews ( http://youtu.be/9Z3dHEWEywA or http://youtu.be/tmeOjFno6Do ). I'd be curious what others thought of this version and also any info on the song which I hope will be released as part of a soundtrack or something.