I have to agree with the sentiments above.
While it takes a bit of practice to listen in a strange language and long ballads are hard work there is a certain magic to the Welsh language when it is sung.
Over 20 years ago on one of my first visits to Wales we visited Llantrisant Folk Club, of course. Halfway through the evening a young girl, we were all younger then, introduced herself as Siwsi. She then explained the rough idea of her song about the tragedy of Aberfan. Now even a Surrey born English-man like me remembered Aberfan.
And then she sang!!!! Any one who knows me knows that I am not adverse to a tear or two and they happened alright during that song. The lovely Siwsi George, who is sadly no longer with us , beacame a firm friend over the years and never lost the ability to put a tear in my eye. God bless her memory.

Andy