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PA stands for Public Address or Public Announcement, and refers to the fact that the sound comming from the PA system is live and not prerecorded. A PA system is used in clubs etc to amplify the sounds coming from a live band or an announcer. There are plenty of techno bands that perform live, like Rabbit in the Moon, The Orb, Orbital, Crystal Method, Prodigy, Chemical Brothers, Future Sound of London, etc. But the main reason that most techno is performed via a Dj is because most producers don't make more than a few tracks. They don't put out albums, and if they do, a vast majority of them aren't good enough to perform live. They rely on computer editing etc to help them out and don't have the capacity to play all of the different samples all at once. This takes an increadible amount of talent and usually at least two people. I don't think that I've ever seen a live techno band perform that only had one guy up on stage, just like you don't see pop or rock music being performed by only one person.
I'd be willing to bet that most techno is produced by a single person, and therefore they don't have the capacity to perform live. Take Blank and Jones, for instance. There are two guys that spin, but also produce their own tracks, but most of the tracks that they spin are not theirs--I don't think that they have ever put out an album soley of new music that they have produced themselves. It has taken them years of development to put out the dozen or so tracks that they have produced themselves. I think that these limitations are why you don't see more live performances of techno bands.
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When you dance, the DJ takes you on a journey, but he or she is usually not the focus of your experience at a club or festival or wherever you hear the music. Dancing is. Music is.
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