Harry Cool sings "Stardust" while the June Taylor Dancers do their thing behind him.
Soundies were short movies, usually about three minutes in length, intended to be played on a sort of video jukebox called the Mills Panoram. You could find these devices in bars, diner,s night clubs and similar locations, usual in urban locations in the US northeast from about 1940 through 1946. Mills and some other companies produced more than two thousand of these films, some of which featured performers who later became prominent.
Harry Cool is not one of them ; he sings this in a nightclub setting and is lushly romantic, but it's a lushly romantic song. Of more interest to me is the June Taylor Dancers, whom I remember from the Jackie Gleason show when I was a kid. Good to see what they were doing before then.