Okay, the Drop D guitar tuning is especially useful for the heavier stuff. It basically allows you to use one finger only and by covering the first three strings from the top (E, A, D) play a power chord in any fret. All you have to do is move your finger from one fret to another and it will always sound good – well, as long as you have your amp set to heavy distortion.
Drop D Tuning Guitar Video
Again, all you need to do is lower your low E-String to a D. The rest of the strings remain in standard tuning. Use your D-String as a reference as shown in the video and tune your low E-String accordingly. After that, you’re good to go.
I personally don’t use that tuning, but if you are looking for particular songs to play along with, just go over to youtube, there are hundreds of them. This tuning is also pretty good if you just want to have some fun with your guitar – it allows you to play heavy riffs and licks without too much finger acrobatic.