Gambeir
Celestial
I didn't really consider that as a cause for it. I know someone in the video was saying it looked just like the northern lights but the guy recording said it had colors in it that wouldn't be in an aurora borealis.
As for the sound, I think that may be a lot easier to explain away than seeing multitudes of colors flashing in the sky. However with the way it was happening in the video, it did look like the sounds and lights coincided with each other, like a trippy thunderstorm with no rain.
There is an ubber rare phenomena where the night sky has been known to project rays of light, evidently very defined and perhaps best visualized as being like the Japanese Battle Flag. I saw one with a friend in Montana when I was in High School in the 1970's. We didn't know what we had seen but later I found this has only been recorded 12 times previously. Now of course I can't remember the name for this phenomena but the video you're describing sounds similar.
PS: At the time we made drawings and wrote it all down including the specific colors, but it's been all lost in time now, however I can describe it as being like a bunch of searchlights all finely focused with different colors such as bright red, yellow, green and white.