Sonorous rocks
http://www.geologyin.com/2019/07/ringing-rocks-geological-and-musical.html
A more plausible theory is that the elastic stresses remained in the rock when the boulder fields formed, and the slow weathering rate keeps the stresses from dissipating. A possible source of the stresses would likely be the loading stresses from the time when the rock crystallized. The diabase sill formed at roughly 1.2–1.9 miles (2–3 km) beneath the surface.
This “relict stress” theory implies that the ringing rock boulders act much like a guitar string. When a guitar string is limp it does not resonate, but a plucked string will provide a range of sounds depending on the level of applied tension.
Obligatory:
Using EEG and TMS for low-bandwidth telepathy
EEG on people staring at flashing lights can pick up difference between different frequencies. TMS can create phosphenes. These guys hooked them together and played Tetris.
https://www.sciencealert.com/brain-to-brain-mind-connection-lets-three-people-share-thoughts
reperiendi 
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