Yo guys!
Really some great replies. :clap:

But explain me this argument:
If you play a piano, for example, the keys and strings are already there, you are kind of reorganizing the sound of the strings.....

Is a DJ a musician then?

A musician creates something with the intend of creating, composing with the intend to do so.

DJing is more random like a discovery type of thing.
He doesn't really know what comes. It's all momental,
and happens at that time when he does his thing.
Especially the thing Dave was talking about when you mix 2 records together...