If there’s one place in the United States that would know the Salvadoran national anthem, you’d think it would be Washington, DC. Not only is it the nation’s capital and diplomatic hub, but it also has a large Salvadoran community. But when El Salvador and Argentina lined up for the anthems for a friendly at FedEx Field in front of nearly 59,000 people, the anthem that was supposed to be El Salvador’s definitely was not.