LeonRegier

I have a hunch that the two staffs treble and bass originate on the piano. The use of both hands and the application of opposing thumbs on the common middle C note. From there it is quite natural without a lot of thot to play chords using thirds and fifths as a foundation. It seems evident to me that the high and low C fall on an outstretched hand width. However the high C is on the third space up and if you think about it in reverse the low C is three spaces down on the bass clef.