(here's a much larger version)
The leitmotiv is the first line of Leonard Cohen's "Hallelujah" released in 1984 on his album "Various Position", but Jeff Buckley's is widely considered to be the definitive recording. Recently Justin Timberlake performed it on the "Hope For Haiti" broadcast and I saw k.d. lang perform it during the opening or closing ceremonies of the Vancouver Olympics.
The formula given near the bottom is Bayes' formula for conditional probability. It's a sort of measure of the probability of a statement given our state of knowledge.
The music is written in an old "Catholic mode" of music. I get that from the fact that it their are double sharps and oddly placed sharp notes. Don
I'm fairly certain the music scores are guitar scales. This probably ties in with the leitmotiv, but I don't think it is important to the overall message.
Regarding the Freeport Section, if it involves any particular place, my guess would be Freeport, Maine because because of the reappearing New England and maritime themes. Also, I thought it might be helpful to cross-reference this mention of Grandpa's Farm with its appearance in other announcements: 9/29/88 - http://www.maydaymystery.org/mayday/texts/88-sept28.html 9/27/89 - http://www.maydaymystery.org/mayday/texts/89-sept27.html 9/26/02 - http://www.maydaymystery.org/mayday/texts/02-sept26.html 12/1/04 - http://www.maydaymystery.org/mayday/texts/04-dec1.html
Comments: The first scale is a mystery to me. The others are just the greek modes: 1: ? 2: F# super locrian (also called 'altered' or 'diminished whole-toned') 3: E Dorian 4: Eb mixolydian