If one wants to know what an angel sounds like, listen to her.
Speaking of angels, in this case male, I'll have to add George Beverly Shea to the list we're compiling. A powerful voice and still alive at the age of 101. He's best known for his stirring rendition of "How Great Thou Art".
Not from 2 years ago, but thought you might like
"http://www.youtube.com/watch?v=czWJfkDCB74"
Check out Amazing Grace by Hayley Westenra
"http://www.youtube.com/watch?v=BOrlCYp8TgU"
Also Ave Maria by Sarah Brightman
"http://www.youtube.com/watch?v=wQQuYhJ_b3w"