Here is a clean metal guitar lick in Drop D tuning. Like a few of the other guitar licks posted recently it can be played at a variety of tempos and still sound interesting. The rhythm is all eighth notes so it should be pretty straight forward even without the video or audio but email me if you need a powertab for any of the guitar licks and I'll see if I can't help out. The only trick to playing this guitar lick smoothly is the placement of the fretting hand. I find it is easiest if you finger the D and G strings with the second and fourth fingers. To me that makes it easier to play the notes that do not remain constant.
Here is the guitar tab: