Kant's thesis was that music and laughter bypass thought processes while eliciting instant physiological effects. And that, not because "they don't mean anything" but because, due to the nature of the aesthetic ideas they embody, music and laughter don't need to be first analyzed in order to have an effect.
Here is what Kant actually said: "But as the play of chance is not one that is beautiful, we will here lay it aside. Music, on the contrary, and what provokes laughter are two kinds of play with aesthetic ideas, or even with representations of the understanding, by which, all said and done, nothing is thought. By mere force of change they yet are able to afford lively gratification. This furnishes pretty clear evidence that the quickening effect of both is physical, despite its being excited by ideas of the mind." (source)
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