Am I being to pessimistic? Loud Music Playing Neighbor?

Im having exams and particularly where my desk can only be positioned, a neighbor is playing his music. Its not unbearably loud, but I can hear the b and the beating. Its never to the point where I can hear the tune but they play music that constantly has a beat. Sometimes I can take it cause its subtle but when Im not listening to music, I can hear the beat in the silence. So annoying! And the thing is that I'm living in townhouses and I have no clue where or who this neighbor is. I've banged on the wall so many times and sometimes they get it. But recently they don't care and just continue with it. Even now at 1:15 in the morning! I really dont get it since there are other neighbors so am I just being pessimistic?