Watch Pentatonix's amazing performance of the national anthem

A cappella super-group Pentatonix was given the honour of performing the national anthem at the 144th Kentucky Derby in Louisville over the weekend.

Singing live, the quintet put their flawless spin on the 'Star-Spangled Banner' - and it's safe to say their rendition was PERFECTION!

The performance was extra special for Pentatonix's Kevin Olusola, who was born and raised in Kentucky.

"I love the Derby, it’s been a huge part of growing up for me. When I was a fourth-grader, in my class, we made this thing called Derby Pie, which to this day is still my favourite pie that I have ever had in my life," he said ahead of the day.

Just listen to those harmonies!