Why not just go tell him to keep his music down b/c its disturbing the peace, call the cops if he doesnt respond, document it then take him to small claims court for it and get some cash out of him or at least cause him a huge headache like he's calling you, if you win he has to pay or garnish his wages or fuck up his credit, its cheap and you can have a sheriff's deputy serve him the notice to appear in court, really bug the shit out of him legally