They've featured Galician pipe players before. Remember, all Celts are very closely related, and they kept up old family, clan and tribal ties all around the Bay of Biscay for thousands of years. That's why it's so very, very difficult to do genealogy among them - they all have the same names!
Even these Spanish guys have the same names, and so do the Irish, the Scots, the Welsh, the Manx and the Bretons.
Done with this. Time to take up my pipes and go out into the street and rouse the neighbors for some fireworks!
I don't think there's anything particularly Celtic in bagpipes originally. It's just that the playing of them has survived in peripheral regions of Europe, in many of which Celtic languages also happen to have survived. I believe originally bagpipes were played throughout Europe. Augustin of "Ach du lieber Augustin" was a Dudelsackpfeifer, i.e., bagpipe player, at the time of the Turkish siege of Vienna, i.e., long after Germans displaced Celts in Vienna.