When the Saxons took over most of Britain, it was just a change of boss-men. They had to keep the peasants on to do all the work, while the bosses got on with boozing and fighting. And who created and passed on folk music? Of course English folk music is celtic as well, as if anyone cared. I only have problems when someone uses "Celtic" as a stick to beat other people's music with - I was once at a festival in Cornwall which banned English songs and tunes for not being "Celtic" (English-language songs from Wales, Scotland or Ireland were OK) Crazy or what? Musicians always have travelled (looking for cheap booze) and picked up tunes from everywhere. I've even heard English Morris dancers using Beethoven's 9th (on melodeon)! Damn good Morris tune. English? Celtic? Who cares?