Quote Originally Posted by Telegraph.co.uk
The monument has baffled archaeologists who have argued for decades over the stone circle's 5,000-year history but academic Rupert Till believes he has solved the riddle by suggesting it may have been used for ancient raves.
Mr Till, an expert in acoustics and music technology at Huddersfield University, West Yorks., believes the standing stones had the ideal acoustics to amplify a "repetitive trance rhythm".



http://www.telegraph.co.uk/sciencean...ert-venue.html

If so then it places Stonehenge into Shaman style trance and vision worship. Sweet.