What’s unusual about the music to the American national anthem?

In 1814, after a night in a pub, Francis Scott Key was taken prisoner during the war between Canada and the United States. When he saw the American flag still flying over Fort McHenry he was inspired to write his famous lyrics with one particular barroom song, “To Anacreon In Heaven,” still in his mind.

TAMPA, FL – JANUARY 27: Whitney Houston sings the National Anthem before a game with the New York Giants taking on the Buffalo Bills prior to Super Bowl XXV at Tampa Stadium on January 27, 1991 in Tampa, Florida. The Giants won 20-19. (Photo by George Rose/Getty Images)

And so “The Star Spangled Banner” was written to the tune of a traditional old English drinking song.