I'm not quite sure what an 'academic interview' is but you might want to go easy on the word Celtic. Technically the music is traditional music from Scotland, Ireland and, perhaps, England and Wales, given a modern re-interpretation. The extreme Western Coast of Europe also has a related association.

In an academic environment you might want to point out that the historical origins of the music are most probably Norse.

The Celtic civilisation, which once spread from Turkey to the Atlantic, was mostly eradicated by the Romans by 400 AD. The bits the Romans missed were over-run by the Vikings 400 years later. I would guess that by 1000 AD there was no Celtic culture left.

The use of the word in it's current context appears to have originated in America. It is a kind of convenient label but in an academic circle it could be judged lazy.