They were competing against eachother in an All State Choir conference in Lousiville, Kentucky last year... but each night all of the choirs participating joined together and created something beautiful.

This You Tube video posted last year has gone viral only recenlty -- undoubtedly because of the start of the 2014 Olympics.

Watch the choirs perform this tear-jerkingly beautiful rendition of the National Anthem from all 18 floors of the hotel they were staying at. It will make your heart swell with pride.

GO USA!!!