I heard Parks live on my birthday last year. He finished with that song, just playing piano and leaving an orchestra sitting behind him. It was breathtaking hearing it for the first time, and so powerful after all of the heavy orchestration from the rest of the concert. Such an amazing way to finish.
I've been slowly transcribing that for about half a year now. I've kind of given up at this point, but one day I'm sure I'll get there.