No instruments needed! Love it! Good job! 

Thanks for the kind words and the listen all. I'm not sure I can convince the songwriter to add instruments but I shall put in a feature request, equality, see how I go.

very great harmony ... lovable !!
Bravo , I will do that !!

Yes, very cool.  I usually don't go for the a Capella type stuff, but this is very well done.  I heard a few little pitch issues as well, but nothing major.  Very good blend of vocal tracks.

Very cool! Your wife has a great voice.
 
Others have noted the pitch issues so I won't continue to beat that horse. They are very minor and probably something that would not have been noticed as much if this wasn't a  vocal only performance.
 I think it would be a great benefit to add a  bass vocal to it.The low voice would round it out more. Also, if you were to add a fiesty emotional solo vocalist after some of those vocal stops, things could take off.Someone with pipes like Aretha Franklin....kick it in with drums...ok I'm getting carried away. Sounds good like it is too.
 
 

A Capella song? I love those boy's at Capella! They rock hard.
 
I enjoyed this, but I'm not sure what the message is/what it's trying to tell me? 
 
Good singing though, good job ;-)
 
BTW - Light? Magnetism? Electricity? All related... Kissing cousins in the world of fizickcs... All moving at the same speed? Almost as if someone had a hand in designing the universe? Hummmmm.... But who could have designed such a thing? Oh yeah! :-) Almost forgot ;-)
 

I, too, like the a capella arrangement of this song.  I think it helps to define the message rather than obscure it.  You both have pleasant voices, and they were captured quite well.  The overall melody is captivating which makes this song a hit for me.

Thanks for the feedback everyone, it's good to know that we are on the right track. I find it hard to add too much pitch correction because I find it obvious if too much is used. There were only two notes that I corrected, both at the end of a line, on the melody part, so they really stood out and had to be corrected or re-recorded. They weren't too far off so I went for the correction.
There is a bass vocal to be added, kind of a low drone, so I hope that will add to the low end. I also hope to add a vocal that is slightly different and more off beat, with different words and timing, to give it a more "solo vocal" feel. Will have to see if this will work or takes away from the "chant" feel we were after.
Thanks again for everyone's kind feedback.

Really cool, it's complete as it is.

Well done, as is.  Would work well during a church interlude instead of having the organ always kick in. ;)