My dear Mr. Platt, the original was a hymn by Ada Habershon.

Chorus:
Will the circle be unbroken
By and by, by and by?
In a better home awaiting
In the sky, in the sky?

The hymn, with midi of original tune by Charles Gabriel, at Cyberhymnal.
http://www.hymntime.com/tch/htm/w/i/willthec.htm