There are a lot of beautiful versions of this song, but this arrangement, by the Canadian Tenors is hands down my favorite. Even though there is a video, this is best with your eyes closed, all by yourself. Try it.
As an added bonus, here is a version of
Pie Jesu that is outstanding... It's by a young boy (you will be amazed
at the notes he can carry!).
He was a contestant on Britian's Got
Talent (no he did not win, but has a recording contract), so bear with
the intro, just wait and enjoy!