It is a music like a band in which they do not talk or sing yet it is music. Dubstep is electronic orchestra. Orchestra music has no words yet it is considered music. Like classical music, dubstep is a song with no words that conveys a story to be interpreted by the listeners.
In rock, pop, jazz, and even rap, there are vocals, (most of the time) real instruments and can be hard. In dubstep, it's just puswing buttons on a computer, which I guess means that rap isn't music. I guess in my opinion, the real types of music are world music, country, rock, metal, pop, classical, and punk.