Schumann Resonance sometimes called a heartbeat of Earth.
It's a frequency of the planet Earth - 7.83Hz.
A little basic info at the start.
It's interesting topic.
What do you know about it?
And what is the correlation between it and Music?
I heard that since 2018 Schumann Resonance changed from 7.83 Hz and now is around 50 Hz.

Let's discuss!

 

Sez here that there are three such resonances in the Schumann family:

https://en.wikipedia.org/wiki/Schumann_resonances

This article cites a rise to 36Hz;

https://interestingengineering.com/science/what-is-the-schumann-resonance

A site with more information on this, plus related to audio and acoustics:

http://www.sound-physics.com/Sound/Schumann-Resonance/

. . . and then, the inevitable angle:

https://ui.adsabs.harvard.edu/abs/2014AGUFMSA11A3918S/abstract

file:///Volumes/Data/DOWNLOADS/HAARP-Resonance.1004.pdf