I think he's has been living in Germany since the seventies. He speaks German fluently and I believe this is where it makes the most sense for him to work. You can see him quite often on TV if you watch certain programmes. He has carved himself a niche as the sort of MOR singer your Mum likes rather than as a folk singer. Wolfgang and Susanne can doubtless tell you more, although I suspect this is not really their music either.