When "God Bless America" is played in Carnegie Hall formal concerts, even the US presidents sang along. A very popular patriotic song can be sang anywhere anytime in that nation. The selection of patriotic songs by the orchestra was their intent to honor the patriotism. For examples, when "Rule Britannia" is played in UK, "Katyusha" in Russia, "Battle Hymn of the Republic" in USA, " Die Wacht am Rhein" in Germany, "Chant de l'Oignon" in France. etc. A real strong country with proud people will break rules to show their patriotism, anywhere, anytime.