National anthem at mass

In Paul Turner's Blog by Paul Turner

Q:  When should the national anthem be sung? My country will be celebrating its National Day soon and there is a bit of debate about when the anthem should be sung. Is it after the Prayer after Communion or after the Final Blessing?
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A:  Well, it depends on the text of the anthem. Some anthems are hymns. Others are not. If it is religious music, it may be sung effectively at the entrance or closing. If it’s not, you could make a case for singing it during announcements after the Prayer after Communion.