I'm listening to Harry's "Mucho Mungo" again right now and I think it's such a beautiful recording. My understanding is that on this one, John wrote the "Mucho Mungo" section which Harry combined with his own "Mt. Elga" piece. They go together very well. I believe John's "Mucho Mungo" demo is floating around online.
Then there's "Old Dirt Road" which John started and Harry finished, coming up with lines like "trying to shovel smoke with a pitchfork in the wind". The bridge of that song is also pure Nilsson. Harry later recorded his own version for his 1980 album Flash Harry - his last studio album to be released before he died in 1994, which is also unavailable on streaming as far as I'm aware.
I'm really torn between which one I prefer. I think they're both beautiful songs and it makes me wish that John and Harry wrote together more often. It's a shame their creative partnership has such a chaotic reputation what with the screaming contest story and all.
I know we don't have to pick but what are your opinions on these songs? Do you prefer one over the other?