yes, everyone has their own creation story...but please, ignore those that has to do with "god" or "saub" or those that has no "mongness" to them. mong qeej, i believe, is truly invented by mong...and by non-god entities...
the reason why i believe the story in youtube is because, mong music has 8 tones..but 4 of them can be reduced to 2...thus this fit all the rest of the instrument, having 6 pitches. the reason why i do not believe in the xeemxais story is because laotion qeej has more than 6 pipes (pitches)...thus pointing to a newer version of the qeej.
yaweh