I feel your pain. I HATED living in an aprtment building and listening to other peoples trash. I beleive OKC has a noise ordinance that they will enforce if you tell the dispatcher on the phone that you are willing to sign a complaint.
I know they have a curfew because I've seen them taking the thug kid across the parking lot home before. I'm sure all they will do for music is tell them to turn it down and 10 minutes later it'll be up again.