The Legend of Zelda Theme

The Legend of Zelda Theme (sometimes called the Overworld Theme) is a reappearing song that serves as the main theme for The Legend of Zelda series. The Zelda Theme was first composed by the now famous Koji Kondo for use in the original Legend of Zelda. Originally the song appeared as a simple 8-bit music track used whenever Link entered the games overworld. The song was later introduced into later games in the series, often remixing the tune with slightly with updated music quality. Since then the song has grown in popularity and fame to become the official theme song for the franchise and among the most recognizable video game music ever.

Music Sample
http://www.youtube.com/watch?v=xbpXsdihJqc