Rikkitic: ... I don't understand what contemporary DJs actually do. Can someone explain this? ...
This is a comparison that I like.
To quote Faithless: "For tonight, God is a DJ". 'Youngsters' go clubbing on the weekend, just like worshippers go to church weekly. The DJ can move the masses emotionally and get 10-100 000 jumping up/down as one similarly to the olden days preacher whipping a whole congregation into a state of frenzy. Add to that the pill popping, snorting, smoking, injecting stimulants. Explains a lot about why people are so emotional about the person getting them there.
Just like the preacher from days of yore, if you can read the crowd you can carry them on a wave higher & higher to a point of climax, with the best of them being able to bring the crowd down again and repeat the cycle.