Here are Super Guitar Bros. with a medley of three tunes and one sound effect from Super Mario World arranged for two guitars. These dudes meet the bar for YouTube covers by having tuned instruments and being competent performers, but the arrangement of the castle theme in particular is really well done. Great, faithful adaptation of often more than two parts at a time for two guitars. I didn’t like the boss theme arrangement as much, since it lacks some of the rhythmic oomph of the original without much to make up for it, but it’s certainly still a jam.
(Source: http://www.youtube.com/)