I do remember your rant. and I can relate. Freshman yr the guy above me in the dorm LOVED to sing, but unfortunatley he was HORRIBLE! and LOUD. Sophomore yr in the apt the ppl above us sounded like they were a heard of elephants int he middle f the night. I swear they played tackle football in their apt at 2am.
Unfortunately sound seems to travel down, so i'm not too sure how much revenge sound wise you could get on them. Maybe put a flaming bag of dog poo on their doorstep? (j/k of course!)