@waltercool i dont remember the context exactly but i remember reading abt F# being a special frequency. Will update when i remember. Something to do with resonance etc.
"Being a musician myself, I was especially interested to discover a patterned musical signature to those resonances that formed an F-sharp chord. Ancient Egyptian texts indicate that this F-sharp was the resonant harmonic center of planet Earth. F-sharp is (coincidentally?) the tuning reference for the sacred flutes of many Native American shamans"
@waltercool see https://www.prosoundweb.com/the-great-pyramid-early-reflections-ancient-echoes/4/
"Being a musician myself, I was especially interested to discover a patterned musical signature to those resonances that formed an F-sharp chord. Ancient Egyptian texts indicate that this F-sharp was the resonant harmonic center of planet Earth. F-sharp is (coincidentally?) the tuning reference for the sacred flutes of many Native American shamans"
See also http://www.gizapyramid.com/Leone1.htm