I would describe Celtic as inclusive of Irish, Scots, Welsh, and English music. But, really, it's just a simple way to describe what I do, to people who are only familiar with the Chieftains and maybe Riverdance.
And yes, I'm well aware that the faster songs do not communicate the emotions like the slower ones do, but my goal is to keep the audient's attention, so that when I sing the really powerful stuff, they haven't drifted off.