"wonderful things about human voices is that, no matter how apparently discordant, they can blend and make those harmonies acceptable to the ear where using those same harmonies with instruments can make many people squirm!"

Modern instruments are mostly fixed in 'equal temper' intonation - human voices generally will, in close live proximity, tend to drift into 'just' intonaton...

But that's already been discussed in other threads...

:-)
~~~~~

"It's not "some new discovery". It's just fun."

It is definitely 'a new discovery' for those who do not go thru formal 'classical' music training process with a fixed syllabus. Sadly many seem to want to make a big case for NOT doing this sort of training (not necessarily 'the full bottle' for everyone, but many basics are easier to understand if taught in some form of rational staged manner), as if that somehow gives them more 'street cred' in 'f*lk music'.

As an old Interdisciplinarian*, I can say that many of the 'basic truths' in life carry over from one area of knowledge to another - music is music, and certain knowledge basics just make life easier...

:-)

* once called 'Renaissance Man'... :-)