PS: When I read the first line in your comment “we are all wired the same”, that reminded me of famous lady gaga blunder “may be we all are aliens”…lol

I think that we are all wired the same. Even through cultural boundaries people have the same response to this, so it must mean that we naturally process the music the same way. After all, human music comes from humans so it was created by human minds (which are definitely all wired the same), and I haven’t yet seen any research on the pentatonic scale used by other musical animals. So while it’s true that music is universal, it is universal only because human musical cognition is universal, which created it.

The point was that everyone in the audience subconsiously chose to sing the pentatonic scale instead of another scale (major, minor, whole tone, octatonic, etc) after hearing only two notes. Bobby gave the audience the first note, and then the second note, but when he jumped to the third note without giving the pitch, the audience knew to sing another whole step up instead of a half step or a third which also would have been a reasonable choice.

The pentatonic scale is the only really universal scale because because of the natural overtone series i.e. when you drag a heavy desk across a wooden floor the pitches you hear constitute a pentatonic scale. Every other scale (including our beloved major scale) either has pitches added in or was entirely made up by musicians/composers.

Gold star, you got it. The point was that everyone just *knows* what note comes next without regards to nationality or musical background.

As I write this, I wonder if the point was that the audience seemed harmonious when challenged with a new note.

Any help??
Thanks.