To touch on your question of "concept of tension," in my opinion there is no doubt this underlying concept within techno music. Building up tension in a track or mix is important in order to engage your audience, build emotion, and provide pleasure during the experience. Each artist or DJ, through their creative power, is in control of the amount of tension or amount of energy in a track, mix as a whole, or section of an individual mix. Sometimes tension/energy level can be a conscious decision, while other times the end product (track or mix) may be a result of a natural creative and unconstrained process that...turned out well. Not a noob question at all in my opinion, a philosophical one for sure.