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Do DJ's like Deadmau5 or Skrillex really mix songs onstage or do they just play them?

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So I was watching this live performance of Deadmau5 and it seems like the already recorded song is just being played for everyone to hear, the guy isn't really mixing or anything. But I have seen times where Skrillex messes up at his concerts but it could be just a technical difficulty? Idk, can someone let me know how that all works? thank you (: