The minute we realise music isn't the authentic voice of another human being we reject it.
Even my enjoyment of arguably mechanical music like some of the early minimalist stuff - where to a degree processes determine the structure and unfolding of the work - is mediated through my awareness of the authorial intent of the composer. (I'm talking more about Piano Phase than Pendulum Music here - the latter is slightly too devoid of human intervention to be 'real music' for me)
How would you feel about a novel generator? Why is that so different?