The National anthem of Saudi Arabia is "Aash Al Maleek" which means in English "Long Live Our Beloved King".
Saudi Arabia's anthem lyrics were written by Ibrahim KHAFAJI and the music was written by Abdul Rahman al-KHATEEB.
Music Adopted 1947, Lyrics Adopted 1984.
National anthem of Saudi Arabia free mp3 download
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(file source: cia world factbook).
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Saudi anthem lyrics (English translation)
To glory and supremacy,
Glorify the Creator of the heavens!
And raise the green flag
Carrying the written light reflecting guidance,
Repeat: Allahu Akbar! 
O my country!
Live as the glory of Muslims!
Long live the King
For the flag
And the homeland!
You can find more information about Saudi anthem on Wikipedia - See link
View the Saudi national anthem sheet music - See link
Saudi national symbol: palm tree surmounting two crossed swords.
Conventional short form country name: Saudi Arabia.
Conventional long form country name: Kingdom of Saudi Arabia.
Local short form country name: Al Arabiyah as Suudiyah.
Local long form country name: Al Mamlakah al Arabiyah as Suudiyah.
Saudi Arabia Government Type: monarchy.
Absolute monarchy is a form of government where the monarch rules unhindered, i.e., without any laws, constitution, or legally organized opposition.