Briar Villa South II Civic Association

Hi I am looking for some advice from my neighbours. My problem is that my neighbours play very loud music in their garage EVERYDAY in the afternoon. I have a 2 month old baby at home and I look forward to a quite afternoon when he naps. But the noise makes it impossible for either of us to rest. Even after repeated requests to keep it down they refuse to listen. I am not sure what to do next.
I would really appreciate it if someone can advice me as to how to handle this situation.

thanks