Thanks. What I hear there is 19s of material on repeat, with the parallel parts variously brought in and out, and no other variation except in decorative detai

Thanks. What I hear there is 19s of material on repeat, with the parallel parts variously brought in and out, and no other variation except in decorative detail. So yes not a literal repeat, but no not enough to rate as a "full song", IMO. Plus it is not actually song at all, note. Singing would particularly expose its repeat-and-vary trick.