National Anthem of the Soviet Union

YouTube link. 

Performed by the Red Army Choir.  When I was growing up in the 1960s and 1970s, this seemed to be the theme song for the summer Olympics.  It really is quite a moving piece of music.

Via Reddit, where the thread also included links to other rousing anthems, and other performances by this choir, including La Marseillaise and "God Bless America."

Please feel free to post links to the best YouTube version of your national anthem in the comments.