It is definiteoy a take off on LIFE IS LIKE A MOUNTAIN RAILROAD, which was very a very popular hymn before the turn of the last century(1900). It's usually played in G, depending on your voice.

G       C    G
//////// //// ////
G         A    D7
//////// //// ////
G         C   G
//////// //// ////
G          D7   G
////////// //   ////

I think(the beats may be a bit off, but you get the idea).

Mark Ross