It’s a song every American has heard countless times, but how much do you really know about our national anthem?

Fortunately for posterity, he did not call it Mrs. Pickersgill's flag, but referred to a "star-spangled banner." Key wrote quickly that night—in part because he already had a tune in his head ...

It’s a song every American has heard countless times – and can probably recite by heart. But how much do you really know about our national anthem? Let’s take a line-by-line tour of the ...