As Tootler & Vielliuese alluded above, the term "Celtic" has apparently been seized upon by The Recording Industry as a convenient marketing label, often applied indescriminately to anything that sounds like it might have come from somewhere in Britain and has folk-ish roots.

My personal theory is that for the American market, somebody decided that "English" or even "British" might have negative connotations (didn't we kick them out o'here a few years back?) but "Celtic" invokes assorted romantic images without the negatives and thus is a better advertising tool.

Val