This song originated from two of the purposes of Samhain, at least in my local grove: First, to honor the final harvest of the last few plants before frost arrives, and to honor our beloved dead, especially those who left us in the last year. From there, it was a matter of looking at what last bits of value we can glean from the passing humans, just as we went through the garden looking for the last tubers and roots that we might eat.
Musically, the meter might look a bit strange, but the 6/4 time can be thought of as a very slow 6/8, with a secondary accent on the 4th beat. The harmonies are pretty standard for the C minor key, except for the F major chord that provides a little brightness to what otherwise could be pure depression.
All works are copyright by yours truly, but may be distributed under Creative Commons Attribution Non-Commercial Share-Alike 4.0. That means, in short, you can use them yourself and your grove, and play the song to your heart's content both in private and in public, but must give credit where credit is due, and if you're planning on selling something involving this song we need to talk about that first.