Pete, I wouldn't have any idea where to find the music, unless a larger music store would have it in a collection of songs from the 50's and earlier. Or if you have connections with a local SPEBSQSA chapter, they might have a barbershop arrangement you could adapt.
The words are:

Not a soul down on the corner;
That's a pretty certain sign
That wedding bells are breaking up that old gang of mine.
All the boys are singing love songs,
They've forgot Sweet Adeline;
Those wedding bells are breaking up that old gang of mine.
There goes Jack, and there goes Jim,
Down to Lover's Lane.
Now and then we meet again,
But they don't seem the same.
Gee, I get a lonesome feeling,
When I hear those church bells chime;
Those wedding bells are breaking up that old gang of mine.