Intro
Each riff in this song begins with the previous measure. I know that sounds confusing, but it’s not really. Not when the song starts looping. Below you’ll notice that the first power chord in the 1st measure is a light gray color. That’s because the notes have been held over from the previous measure. Since the four measures of the riff loop over and over the previous measure would be the 4th measure.
Verse
This riff has 2 guitar parts. Here’s what they both sound like together: