"The Star-Spangled Banner" was a poem written by Fancis Scott Key during the War of 1812. Key witnessed the bombardment of Fort McHenry in Baltimore Maryland on September 3, 1814. Key's poem was set to the tune of "To Anacreon in Heaven" which was an English drinking-song.

Key was sent by President James Madison to negotiate a prison exchange with the British. Key and his companion were successful in their negotiations, but were held aboard a ship in the Chesapeake Bay because they had overheard the British war plans. While on the H.M.S. Tonnant, Key observed the bombardment of Fort McHenry in September or 1814. He did not know the outcome of the battle until the sun rose and he saw the American flag still waving over the fort. He began the poem while still aboard ship and finished it after his release. His brother-in-law recognized that the words fit the tune of the drinking song and it was published in that format.*

The song was recognized for official use by the United States Navy (1889) and the White House (1916), and was made the national anthem by a Congressional resolution on 3 March 1931. Although the song has four stanzas, only the first is commonly sung today. Like the British national anthem "God Save the Queen," "The Star-Spangled Banner" is one of the few national anthems of the world without a country's name mentioned in the lyrics.

The Complete lyrics of the song are as follows:

O say, can you see, by the dawn's early light,
What so proudly we hailed at the twilight's last gleaming?
Whose broad stripes and bright stars, through the perilous fight,
O'er the ramparts we watched, were so gallantly streaming!
And the rockets' red glare, the bombs bursting in air,
Gave proof through the night that our flag was still there:
O say, does that star-spangled banner yet wave
O'er the land of the free and the home of the brave?

On the shore, dimly seen through the mists of the deep,
Where the foe's haughty host in dread silence reposes,
What is that which the breeze, o'er the towering steep,
As it fitfully blows, now conceals, now discloses?
Now it catches the gleam of the morning's first beam,
In full glory reflected now shines on the stream:
'Tis the star-spangled banner! O long may it wave
O'er the land of the free and the home of the brave!

And where is that band who so vauntingly swore
That the havoc of war and the battle's confusion
A home and a country should leave us no more?
Their blood has washed out their foul footsteps' pollution.
No refuge could save the hireling and slave
From the terror of flight, or the gloom of the grave:
And the star-spangled banner in triumph doth wave
O'er the land of the free and the home of the brave!

Oh! thus be it ever, when freemen shall stand
Between their loved homes and the war's desolation!
Blest with victory and peace, may the Heaven-rescued land
Praise the Power that hath made and preserved us a nation.
Then conquer we must, when our cause it is just,
And this be our motto: “In God is our trust.”
And the star-spangled banner in triumph shall wave
O'er the land of the free and the home of the brave!
Retrieved from "http://en.wikisource.org/wiki/The_Star-Spangled_Banner"

The Wikipedia article on The Star Spangled Banner has interesting links.

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* One can do this with many poems and songs. For example, the following verse from The Lay of the Last Minstrel by Sir Walter Scott fits perfectly to the title song from Exodous:

Breathes there the man with soul so dead
Who never to himself hath said,
This is my own, my native land!
Whose heart hath ne’er within him burned,
As home his footsteps he hath turned
From wandering on a foreign strand!
If such there breathe, go, mark him well;
For him no minstrel raptures swell;
High though his titles, proud his name,
Boundless his wealth as wish can claim
Despite those titles, power, and pelf,
The wretch, concentred all in self,
Living, shall forfeit fair renown,
And, doubly dying, shall go down
To the vile dust from whence he sprung,
Unwept, unhonored , and unsung.
This is my own, my native land!
Whose heart hath ne’er within him burned,
As home his footsteps he hath turned
From wandering on a foreign strand!
If such there breathe, go, mark him well;
For him no minstrel raptures swell;
High though his titles, proud his name,
Boundless his wealth as wish can claim
Despite those titles, power, and pelf,
The wretch, concentred all in self,
Living, shall forfeit fair renown,
And, doubly dying, shall go down
To the vile dust from whence he sprung,
Unwept, unhonored , and unsung.

Robert Frost's Poem, Stopping By Woods On A Snowy Evening fits to the tune of Hernando's Hideaway.

Whose woods these are I think I know.
His house is in the village though;
He will not see me stopping here
To watch his woods fill up with snow.
My little horse must think it queer
To stop without a farmhouse near
Between the woods and frozen lake
The darkest evening of the year.
He gives his harness bells a shake
To ask if there is some mistake.
The only other sound's the sweep
Of easy wind and downy flake.
The woods are lovely, dark and deep.
But I have promises to keep,
And miles to go before I sleep,
And miles to go before I sleep.