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I think these sounds are probably geological in origin hence this one occuring near the Yellowstone supervolcano.
originally posted by: MissSmartypants
In an article called “Overhead Sounds in the Vicinity of Yellowstone Lake” from Science Magazine, 1893, by Edwin Linton wittnesses described hearingand the article goes on to describe it further...
a reverberating sound, characterized by a slight metallic resonace.
what one of the party called a kind of twisting yow-yow vibration.
Well, I don't know about you but that sounds just like the sky sounds that have been posted here on ATS lately.
Once you click on the link you have to scroll down the page to get to the article on the sounds.