I also revisited the quotation of "Cwm Rhondda" (from ~6:01 to ~6:27). I wrote about it years ago, but since then, I've learned how to format notation better. Argent's quotation* is in red; the section of "Cwm Rhondda" that he's drawing from is in black:
In "Cwm Rhondda," this is played only once, but Argent plays it twice (with some variation). I put the six measures from "Cwm Rhondda" under both lines of Argent's part for easier comparison, and I adjusted the width of some of the measures for something of a one-to-one relationship.
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*I should specify that this is what he plays on Moog. Simultaneously, he's playing organ, and while much of that simply doubles what he's playing on Moog, there are differences that I haven't even ventured to figure out yet.
