Kinda sucks that the video that depicts the original single doesn't have the original audio. I attempted to find a replacement mono video, but had no success. Perhaps an owner of this single could oblige us with one.
And yet, the mono version in the YT video linked by RD isn't the one on the actual single.
As I said in my original comment (4 years ago! Sheesh, where does it go?), the single version (at least, the one I have, which was the original pressing as far as I can tell), the strings weren't completely mixed out of the ending.
If I can find the sound file again, I'll re-post a link to it so you can hear the difference.
(Edit: found it: here it is again. The first clip is the single, the second one is the one more commonly found on compilations, etc.)
I've noticed a buzzing noise, probably from Hank's amp , during the first few bars of the main melody on the vinyl and early cd stereo recordings which seems to have been eliminated on newer cd releases.
In the second one, the guitars may seem louder, but that's because the strings (particularly the cellos) have been all-but mixed out. Which was my point about the difference. As a result, it doesn't have the clout of the mono single mix to my ears. But then, that was the first version I heard, way back when I was about six or seven.
This is one of my all-time favourites, but the stereo version you get on compilations, etc. has the strings mixed far lower down throughout, and mixed out altogether in the ending. I think that the original version is far stronger (or maybe it's just bias on my part). You can hear what I mean at http://www.thejudge.me.uk/soundbank/Atlantis_endings.mp3, where the first version is the original single mix and the second is the stereo mix (but converted to mono in this case).
[Edit (18/05/11): I've taken the sound file down now - sorry!]