Unfortunately, #, it's just a passing reference from a list of songs being performed.

The song is more correctly titled "Men From the Valley of Apple Pie" (note the lack of the second "the"), which could me hampering searches.

The song is included in at least 5 different songbooks but sadly none available anywhere online or remotely near me. See here

The first line seems to run: "Each night I see them marching by, the men from the valley of apple pie"