It's no surprise that so many European groups sing in English. English has become nearly every European's second language...except in the UK of course.
An English language CD by an Estonian rock band is going to garner more sales and play time on radio all over the continent than one in their native tongue. As such groups gain popularity in Europe, their promoters will get them into the US market. Essentially, as English becomes the primary international language, every market will be open to everyone.
I enjoy music in a number of languages and own CDs or MP3 downloads in Italian and Gaelic (my two favorites) plus Spanish, Greek, Hawaiian, and several African languages. I enjoy the variety of music styles even though I can understand a little of the Italian and absolutely none of the others. We heard a folk music group in Prague several years ago; didn't understand a word but loved the melodies.
Sorry to hear, Kevin, that the "Great Firewall" is back in place.