In the anime Deathnote, there is a soundtrack song that sounds like a men chorus; what's the name of the song?

Question

It plays often in the anime when Light is having an enlightened moment. One of the times is when L and Light have a tennis match and they are both thinking to themselves how they can discover the identities of one another.

Answer 1

That's the Death Note Main Theme by Yoshihisa Hirano.

If you have a free Gendou account, you can get it here: http://gendou.com/amusic/?filter=death+note+theme&match=0

edit: actually there are a bunch of different songs with the male vocals that sound similar.
Here are some of them that can be found on the first OST:
Kyrie
Domine Kira
Low of Solipsism (the best imo)
Requiem
and there are some more...