King Of Adiemus is a song from Silent Hill: Origins, composed by Akira Yamaoka. It is track 7 in the game's soundtrack.
The word "adiemus" closely resembles a Latin term meaning "we will draw near." However, it is most well-known as a series of vocalise-styled albums by Welsh musician Karl Jenkins. In these albums, there are no words in the pieces, but instead, the focus is on musical vowels.