The difference is between sitting around listening to music and partying to music. You can’t just be walking back and forth on stage, otherwise it could just be a seminar.
Lil Scrappy on crunk, quoted in Dirty South. You could say that the music happens between fans and stars rather than between listeners and musicians. And like Little Steven says, performance relies on a working-class energy. And then there’s Elijah Wald’s observation that critics tend to be people that collect and discuss music, rather than dance to it.