But probably 50% of the global population listens to US music.
Also there are local musicians popular in each country. And there are musicians from countries other than the US that are international but unknown in the US.
Anyway, Eurovision is quite irrelevant in Europe too :)
Edit... for native English speakers, consider this: there're songs in which the lyrics are more important than music. That kind of music is usually boring if you can't understand what they're saying.
Look at the Billboard (or equivalent) charts for Germany, France, Argentina, or any other non-Anglo country; maybe 10% of the entries are English language or from American artists.