Stole this video from @fenwizard , its really good, their voices almost remind me of that one Autralian instument that I dont know the name of but makes a really cool unique sound:
Overtone Singing & Deep Voice Chant with Tibetan Monks
A+ sounds, I only wish I could edit out the one guy who makes randomn “ho” sounds, like he stumbed his toe and is in pain. lol, its really distracting from the harmony.
This is the instrument:
Didgeridoo Sound | Australian Instrument
Did not realize it is technology that is over 40,000 years old!