Hai, um, dum, do, da, diddly, duddly, dum…you can hum along to this mellifluous Irish song if you want, and if you feel like dong an Irish Step Dance, these boys will teach you how to do so. But these boys are not Irish; they look like a group of hip-hop American kids. Can they tap dance to an Irish folk song? Oh yes, they can! They teach us that like songs, dance is sans frontiers.