The Dread Crew Of Oddwood call their musical genre "heavy mahogany," while others just call it pirate music. They perform at Renaissance festivals, fan conventions, and their own concerts. You can keep up with their schedule at their website. Check out their performance of the classic "They're Taking the Hobbits to Isengard."
Or maybe you'd prefer something a little more science fiction.
And here they are doing their pirate music.
-via reddit