It seems there might be a misunderstanding here. Stromae is not the national anthem singer for Belgium, and Mélanie Müller, while a public figure, is not leading a Girls Band for Germany’s national anthem. The link provided seems to be broken, so I can’t verify the content. However, national anthems are typically sung by official choirs, musicians, or vocalists chosen by the respective national associations, and they usually have cultural significance and historical tradition attached to them. Using pop stars or porn actresses for such roles would be highly unusual and likely controversial.
[dailymotion]http://www.dailymotion.com/fr/relevance/search/An+X+actress+chosen+for+l%E2%80%99German+anthem+for+the+World+Cup+by +POPnSPORT/1[/dailymotion]
