I've been playing Diablo 2 enough to memorize its soundtrack, and I've heard this distinct singing from it in more than one other composition. But it's not in any language I can recognize, and I don't even know how it's spelled. None of my friends that know foreign languages could identify the lyrics, but given the genre it's probably not French or Spanish. The tracks I know of that contain the singing I'm interested in are:
I'd like to know what these mean and if possible where these voice samples come from.