Nerd: the complication is that you are defending the use of the term "Celtic music", but you are saying that the category includes English music. The trouble is, most people who started using this term didn't include English: they meant Irish, Scottish, Welsh, plus assorted others Breton/Cornish/ Galician etc. But specifically not English. The whole point of the term Celtic was to differentiate yourself from the English. Anyway, I think the term is useless and merely a provoker of ethnic/national hostility when applied to music as it has been in the past. Best kept for linguistic purposes, wjhen it has a precise and definable meaning and is not loaded with prejudice.