B sharp, don’t B flat, and always B natural…
Very good demonstration! Really enjoy how Mr. G ties it back to the piano and neck of a fretted instrument.
While the “Dead Monk Rule” is a cute way of avoiding explaining stuff that would be way beyond my comprehension, I must tip my hat to the monks who figured out a way to organize the trillions of possible note combinations so I can play “Cripple Creek” in the 21st Century.
Maybe those so-called “dark ages” weren’t so dark after all!