I actually saw a show on the Science or Discovery Channel about Stonehenge that was about this. They hyphothesized that the stones are set where they are so that during 'ceremonies', by beating their drums at a certain tempo it could help everyone enter a trance-like state. They also found that the sound actually got louder the farther away from the speakers you went (while still in the circle). They said something about the tempo and the vibrations of the bass would actually help everyone's heartbeats/other inner-systems sync together. They then compared the effects to bass heavy music often played late night in dance clubs.
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