Glory to Hong Kong - Protesters Create National Anthem Favorite 

“Glory to Hong Kong,” created less than three weeks ago, has rapidly been adopted as a symbol of the pro-democracy movement.

via NYTimes:

"Written and composed anonymously, then modified in online forums popular with protesters, “Glory to Hong Kong” features the kind of brass-heavy backing and soaring lyricism common to anthems, including the line “May people reign, proud and free, now and ever more.” In a slickly produced video version, an orchestra and choir dressed in protester garb — black shirts, helmets and gas masks — perform through a fog machine, meant to evoke images of tear gas."