As soon as you obtain the required fame, Jatan-Paratan will mope about and act depressed instead of playing music for you. If you chat to everyone else in the restaurant, they will express concern about Jatan and mention that this episode was triggered by a bearded hume bard friend, perhaps from Jeuno.
The flutist Jatan-Paratan, who plays at the tavern, has lost his swing and now blows. It sounds as though a Hume bard who visited him lately is to blame, or maybe it's just a case of "bard luck"...?