Moon Dreams is a standard of sorts, composed by Glenn Miller's pianist and Johnny Mercer, which may very well make it the only instance of of Miles covering Glenn Miller. The Glenn Miller version can't be found on YouTube, although you can find it on Spotify, but you have to search for Glenn Miller Moon Dreams. For a standard, it hasn't been covered much. There's Glenn's version, which isn't all that good, and one by Martha Tilton -- the first recording ever made for the fledgling Capitol Records.
But it seems it took Miles to really find the beauty of the song. As with many of the other Birth of the Cool cuts, it was covered by other artists from the session, like Lee Konitz. Again, not too many others. But both Airto and Flora Purim have recorded it, separately and together. Here's Flora's version --