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Hylopath has ongoing investigations into acoustic archaeology ‘archaeo-acoustics’ (which includes Psychoacoustics and neuroacoustics) is supported by www.soundfjord.org. This Archaeoacoustics wiki page helps explain. Most old theories have been scientifically discredited, yet ideas still continue to spark the imagination. Hylopath, in light of new science studies of acoustic phonon crystals, is asking what happens to a sound after it has gone, do these acoustic waves/particles leave an archaeological trace in matter and time…? If so, would it be possible to somehow retrieve these sonic imprints?