I knew Moondog. But I was a fan of his first 10" LP of children's music. He chose an unknown struggling actress named Julie Andrews. Alas, the 10" is gone. But I hope you have the music.
As to "knowing" him, he and I took the same subway to Manhattan in 1960. He was intimidating, maybe 6'6", in full Viking regalia, including a spear that was 3" diameter. But that was a different time, an age when you could actually go up to someone famous and initiate a conversation. (Those initiations was not always gladly received, however.) He and I had several conversations, but I was involved in experimental music - the FLUXUS group - and he was a loner, who only used his own instruments, so they didn't go anywhere. Also he was, should I say, "spiritual", and I was a radical. But he was a sweet, gentle soul. Whenever, thereafter, I would see him on 6th Avenue, I'd go say hi, and he always remembered my name!
Please let me know how to make a modest contribution to your project. I'm not seeing a link.