The lyrics of the Himno Nacional Argentino (the national anthem of Argentina) were written by Vicente López y Planes, and the music was composed by Blas Parera. This song was adopted as the national anthem on May 11, 1813, three years before the formal declaration of independence from Spain. May 11 is therefore Anthem Day in Argentina. 

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Modern Version (adopted in 1900, without the vivid attacks against Spain)

Spanish lyrics

Oíd, mortales, el grito sagrado:
"¡Libertad, libertad, libertad!"
Oíd el ruido de rotas cadenas,
ved en trono a la noble igualdad.
Ya su trono dignísimo abrieron
las Provincias Unidas del Sud
y los libres del mundo responden:
"Al gran pueblo argentino, ¡salud!
Al gran pueblo argentino, ¡salud!"
Y los libres del mundo responden:
"Al gran pueblo argentino, ¡salud!"
Estribillo
Sean eternos los laureles
que supimos conseguir,
que supimos conseguir.
Coronados de gloria vivamos...
¡o juremos con gloria morir!,
¡o juremos con gloria morir!,
¡o juremos con gloria morir!

English translation

Mortals! Hear the sacred cry:
"Freedom, freedom, freedom!"
Hear the noise of broken chains,
see the noble Equality enthroned.
The United Provinces of the South
have now opened their very honorable throne.
And the free people of the world reply:
"To the great Argentine people, Cheers!"
"To the great Argentine people, Cheers!"
And the free people of the world reply:
"To the great Argentine people, Cheers
Chorus
May the laurels be eternal
that we knew how to win,
that we knew how to win.
Let us live crowned with glory...
or swear to die gloriously!
Or swear to die gloriously!
Or swear to die gloriously!