Man, I really feel for you. At my old apartment, the people across the way from me had some very immoral parties going on, and I won't go into detail.
I slept soundly (my bedroom was in the back) while the poor lady below them repeatedly was awakened -- the sheriff was no help, either; supposedly he partied with them when he took the call one night.
I don't know why they weren't evicted.
Evicting people is extremely hard, from what I've heard. All the laws regarding eviction protect tenants.
This guy just likes loud music with a lot of language I'd rather not hear. We could call the police, I suppose, but I'm always unsure whether I'm just overly sensitive or if it's really that bad. I mean...I never did the college dorm thing, so I don't know what's kinda normal.
If only I could figure out a way to get my bagpiper brother here to pipe in some music at about five AM without bothering any other tenants... Bwahahahah!