Man has been dancing to music since he first found out wacking a stick on a hollow log made a nice sound.
Drugs weren`t always a part of this.
Dance music in native culture is very rarely drug assisted.
It`s normally a ritual, putting people into a trance-like state through the use of repetative rhythms. the coming together of people dancing provides an energy in itself, and is a very powerful thing. I think this is one of the reasons why free parties were clamped down on so heavily.
For me the best music gives me the rush without the drug.