Drop D Tuning
This song is in drop D tuning. In drop D tuning the low E string is tuned down one whole step to D. To tune your guitar to drop D tuning, first make sure your tuned to standard tuning. Then you’ll want to tune your low E string down two steps to D (we drop it down one step, hence the name).
Below is the very first part of the intro. We broke it down so that you could see the other measures easier.