I was just wondering if anyone could point me in the direction of some music similar to this - http://youtube.com/watch?v=hEuAflISyg8

It's the track "Chandelier" from Ace Combat 6, which I really like. Any info would be appreciated.

Gregorian chants, and of course, normal Catholic chants, sound like this. The different in between those two is that Gregorian chants are only made up of male voices, while the others can be mixed or only females.

Also, try on finding the Vienna Boys' Choir.