Earlier this week, I figured out the mellotron organ part from ~3:17 to ~3:51 in "Peak Hour." Back in January, I wrote about how the contrast between this section (with a slower tempo and sparse instrumentation) and the rest of the song illustrates the difference between the relaxed narrator and the rushing people. This morning, after having played the part numerous times over the course of a few days just for my own enjoyment, I realized that this relaxed attitude is present even in the music of just this small section. The note values progressively lengthen (from eighth notes to half notes to whole notes) to illustrate that "I've got time."
I'm a bit unsure of some specific voicings, but I think the part is something like:
(I adjusted the split point between the two staves so the notation looks a bit more balanced.)