Talk to Jatan-Paratan and he'll ask you how you feel about his music. Answer his question. It may take several answers until he will start to talk about the tavern and ask you your opinion. Saying that you don't recall the music (the last possible answer) and then talking to him again should start him talking about the tavern.
When he asks your opinion on the tavern, talk to Aramu-Paramu, and he will also express his worries about Jatan-Paratan. The quest should now enter your log.
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"...?