There are so many American myths: the Mayflower Story, George Washington never telling a lie, and then there is Francis Scott Key penning the lyrics to what became our national anthem. How much is of the "Star-Spangled Banner" story is true? Join Deb Polich on this edition of "creative impact." She welcomes back musicologist Mark Clague, whose new book, "O Say Can You Hear?" breaks down the music from the myth.