The song is tuned half-step down, and Drop C# when you play power chords. If you don't know how to play power chords, tuning half-step down is sufficient. The picks however are still tabbed in Drop C# because it's easier to play that way. The names of the chords are still in standard tuning, if you want the names of the chords half-step down you can use the transpose button on the left. Throughout the whole song chords are strummed, except for the intro and first verses. The pick patterns are (guitaretab.com)