10k
And Low-Gain to say that the definition of musical performance hasn't changed is quite naive.. I don't think performances need to have someone physically playing music on an instrument to be classified as good.
a lot of the artists mentioned (Meneo etc) are amazing because of the performance and show they deliver beyond just twiddling knobs and triggering sequences.. I personally prefer a good electronic music performance over someone just playing instruments over the top of a sequence.
artist not mentioned yet and not entirely chip:
Blastcorp (uses a Monome256 like a god)