Copywright issues

Due to copywrighting laws; the music I will be using is a newly released, widely recognised song by a popular band, I would need to gain the permission to use it from the copywright holder. I could do this by writing a letter to them but instead of this I have found a cover of the song on 'Youtube' which is not copywrighted which I will use.

This version is an acoustic cover by Phil Olczak and Aaron Smith.