I've heard about this before and thought that maybe someone may have some additional insights to share with our community.
Tombs in Orkney and standing stone circles in Aberdeenshire were constructed to amplify the music until it left worshippers in a trance-like state.
And the effect of the low-frequency sound, which was mood altering, would be amplified by light. The discoveries were made by two scientific teams,
working in parallel, examining Neolithic sites in Scotland, England and Ireland.