Old Joe Clark is an old-time American folk tune arranged for flatpicking guitar. It features multiple arranged and variations, making it great vehicle for flatpickers looking to hone their technique.
If you are a Beginner, start with the Bluegrass version at the easiest level. It will require only down strokes. At the hardest level this tune will be a fully fledged fiddle tune that's fit for any jam or stage. There is a vast amount of licks for you to explore. Add one or two to learn some new techniques, or create completely new versions of this tune! If you are ok with doing a bit of alternate picking, the Low Octave will also be great for you to explore. At the easiest level it requires just a little bit of alternate picking, at the hardest level it's a fully fledged fiddle tune for the experienced flat-picker.
If you are an experienced picker, check out the No Capo, or the No Capo - Low Octave arrangements. Playing a tune that's traditionally played without a capo opens up the possibility for a whole new world of sounds. Check the tab descriptions for these tunes and the others for even more picking and practice advice.