Celtae - Killer Cod (tunes w/ a few vocals) 

From their 2002 self-titled album.
Composed by their first fiddler, Jules Sisk. They used to end every gig with this tune.
On the track are Jules Sisk (fiddle), Matt Holland (bass), Nathan MacDonald (bodhran), and Tyree Lush (guitar). They all provided vocals, along with two additional musicians, e.g., Davey Melvin & Rick MacDonald.