There's this band, or group that was popular in the 1990s I remember my dad had a couple of their CDs. Uhm... how to explain. They sound like a choir at first.they're singing in Latin or so. Then there's also like a rock beat to it. Don't know if that makes sense. But I've been trying to remember their name. I think it starts with an A, I may be wrong. Their album cover usually has some religious symbol on it. The music is eerie in a way.

Could it have been "Kyrie?"

That was a cover of an old hymn re-done by Mister Mr.

Mr Mister - Kyrie Eleison - YouTube

It's Enigma.

Enigma - Sadeness - Part i - YouTube

I listen to them when I need to relax. I have every CD.

Another of my favorites.

Enigma - Return To Innocence - YouTube

Oh yes!! It's Enigma! Wow awesome! Thank u guys. :)

I love them, if you can't tell! Your description was perfect!