I'm not really sure that the other acts totally lack artistic integrity, but I'm pretty sure that ytcracker isn't a novelty act.
Some of them aren't serious and have the overdeveloped sense of irony that you expect from people kidding around, but I'm not sure that that makes them novelty music any more than, say, The Electric Six are.
Some of them aren't serious and have the overdeveloped sense of irony that you expect from people kidding around, but I'm not sure that that makes them novelty music any more than, say, The Electric Six are.