I think what Dem means is that these bands, Nightwish and Within Temptation, to name a few are 'Top 10' bands in mainland Europe and when they release singles they're in the charts and the bands are a big deal, but in the UK they aren't, and we have the likes of Ed Sheeran at Number 1 for weeks and selling out multiple nights at Manchester Arena etc, I couldn't name you a single Ed Sheeran song but I could sing you all of the Within Temptation catalogue