Music is definitely what matters at those type of events, as for a state of euphoria, that can be seen as naturally occuring as everybody around you in high spirits tends to lift you also.
(Possibly because of the chemicals they sweat while on their differing substances)
I know in Britain when the legislation was passed about illegal gatherings was passed they certainly did crimp the style, people were no longer allowed to enjoy the outside unless all the surround councils, tennants and land owners agreed, this forced all those people to push the limits of clubs (to even make them exceed the fire safety levels)
Of course if they were allowed to come back I wonder would that bring back the spirit of some of the young, or was it all these stories of people dieing on drugs that made them decide that the gathers would no longer be allowed (I shall never really understand)
I did once go to a pretty big venue that involved more than one club in a town because instead of differing music being contained in a different room of one club, they had multiple clubs all playing at the same time.
87 people were arrested for Drugs offences out of 10,000 and for that the Town said "No more", yet when you look at the percentage of people that were arrested. 0.87% arrested for drugs offenses, that percentage I would class as acceptable for the turn out, it proved that our town was hell bent on killing anything that could possibly increase it's economy.
Now the town suffers a great number of social security cases and alot of dodgy hyperdemic people have moved into the area (The locals are leaving in droves)
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Stryderunknown