According to Wikipedia, “Arirang is a Korean folk song, sometimes considered the unofficial national anthem of Korea. Arirang is an ancient native Korean word with no direct modern meaning.” The additional lyrics, romanization, translation and more information about this folk song can be found on Wikipedia at http://en.wikipedia.org/wiki/Arirang#The_lyrics:
아리랑, 아리랑, 아라리요…
아리랑 고개로 넘어간다.
나를 버리고 가시는 님은
십리도 못가서 발병난다.
Traditional version of Arirang (contains lyrics in Hangul as subtitles):
Symphony version of Arirang:
Boys’ Choir rendition of Arirang:
This particular YouTube video helps with pronunciation: