Leahy -- My Very Favorite Fiddling/TapDancing Video

"Excuse me while I pick up my jaw from off the floor."

I'm borrowing that comment, but it's about right.

("Shadowfox 84" left those words at the YouTube page for this video.)

Original fiddle music at blazing speed.
Super-impressive tap-dancing beginning at about 4:25 into the video. 

Donnell Leahy and his talented brothers and sisters are one of Canada's great gifts to Celtic music in this generation. If you're new to them, you may want to learn more here.
Their website is here.