I have been in your position and what Lady Penelope says below is the right course of action.
Make a diary of the music and make sure this is submitted to the council, also ask the council to ensure the letters of complaint go the registered owners (parents) just just to the kid.
Also ring the police and get the call number and make a note, enough calls and they will put them on a watch list. even if you give them the parents address (should be on the title register), then this might give them another way to get the situation resolved. I did this and the police contacted the parents (after the kid moved out) and they did not know letters and complaints had been received with the council.
Also talk to others in the strata and get them to make a list too. The more people the better your odds are, trust me.
You have to get the parents involved and make sure that as the owner all consequences fall on to them.
In the mean time see if there are other things they are doing that may violate council rules. I got rid of my pest after i complained about his dogs, two unregistered pets on the property (four in total). I made a noise log and submitted it, the kid was fines for failure to register the pets. They only did one and then left.
While i do not recommend leaving the stereo on all night. ( I must admit there were times i thought he was worth the jail time), there is a reason Barry White and Barry Manalow are played on loop at the Train Stations.