Oh, say,

http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/music/piano/flute.htm

I applied the notes on the virtual keyboard, I like the flute sound. The notes are available online somewhere; I did a few change, such as replacing some notes and dividing sentences into short word groups, so that the music still sounds good even at first play of a person who is not good to move fingers on keyboard. 

VIRTUAL KEYBOARD MUSIC NOTES	The Star Spangled Banner  LYRICS
G    E   E    C E    G    C1 E1    D1    C1    E     E    F#    G   G    G  E1    D1   D1   C1  G A   B   C1 C1    G E    C	Oh, say. can you see . by the dawn’s. ear ly light.   What so proud ly we hailed. at the twi light’s, last gleam ing?
G  E  E  C E  G  C1 E1  D1  C1 E E   F#   G G   G  E1  D1   C1  G A B C1 C1 G E E C	Whose broad stripes and bright stars. thru the peri lous fight.   O’er the ramparts wewatched. were so gal lant ly st ream ing?

The music repeats exactly in 2 different paragraphs, but the lyrics is different. 
 

Figure: The arrangement of music notes on the small piano.

A small piano will not cover some details or music notes for some songs.

Many instruments will not cover human voice created music details.

 

SINGING, HOLDING BREATH DURING SINGING
When singing with own human voice, breathing breaks should be mind. For example, take a breath when 'Oh say' lyric finished; but hold breath when singing 'Oh say'. Singing with proper breathing makes music good. Music is different from speaking, breathing is not between sentences always.

 

Even if my purpose is just singing, I like checking music notes written for musical instruments.
Almost any music sheets are detailed for musical instruments but not for human breathing, human breath intervals. Almost any musical sheet will give correct music notes for human, but will not explain where are the breathing stops that will not ruin singing. This is because human breathing vary by age, or lung muscles, lung fat etc. Many singers are not better voiced than others, but they control their breath in, breath out times well at appropriate places of a song.  I like Star-Spangled Banner when a soprano sings it.
Whoever created, composed it for piano; I believe was not a fast player, the music will sound good, even if an ordinary person, first time hits the above notes on a simple piano slowly.
 Not the entire song, but the above paragraphs at the beginning of the song suit to sing when walking with heavy things. There are frequent breathing times. But the walking speed should be constant and not too fast when singing this song. Singing this part of the song makes walking with heavy things enjoyable.
But the part quoted here:

''And the

rocket’s

red

glare.

the

bombs.

burs ting

in air.''

can not be sing easily when walking with heavy things.

In this video below, I played the quoted letters belove:

‘’ E1  D1  C1  E  E  F#  G

G   G  E1  D1 C1  G A B C1 G E C ’’

The quality of the video is not good itself, because I have a screen in front of my small computer that is good for my health. The radiation protecting screen made the video recording too bad, too dark, sorry about that. I need to use a different technology next time, anyway I am sharing the video that I hit the above letters.

 

VIDEO 1: E1  D1  C1  E  E  F#  G  G   G  E1  D1 C1  G A B C1 G E C

...by the dawn’s early light. What so proud ly we hailed, at the twi light’s, last gleaming?

I used a different virtual piano here to play ''
Oh, say does that star-spangled
banner yet wave
O’er
the land of the free
and the home
of the brave? '':
A brief video record from my computer screen is here.

                                        

VIDEO 2:Played this piano using different lettering.

Letters are for ordinary computer keyboard letters as if I am writing .
I am hitting my computer keyboard letters of  '' s s s s a p p p d g f d s sa ... ''.

 

Below is the universal music notes for the start of the music.

 

 

 

It is definite that there is a difference in anthem music in general, one can hardly dance with anthem music rhythm. I looked for World Music systems that fits to The Star Spangled Banner anthem; I believe, its rhythm fits to Turkish Art Music, it fits to Rast Maqam musical modal or sound scale.
Specially the ''O'er the ram parts we watched, were so gal lant ly st re armin'' part reminds me a Turkish Rast Anthem of an International Political Sciences University.
Anyway, the Star Spangled Banner anthem has its unique music and words as a whole.