How do I make my wife stop singing?

My wife invited her sisters over to the house last month and they stayed there for over a week. They got all drunk ever nite and carried on like a bunch of school gals and they would get to singing about ten oclock ever nite and it sounded like a pack of coyotes after they swollered a bunch of broken glass. They would all go down to the kareokie bar and sing till they was kicked out and now my sasquatch of a wife, who weighs over 350lbs, sits around ever nite and sings into her camcorder hoping she can send it to American Idel and git a job singing. I can't take it no more. I even go outside and sat in my car at nite but the sound of her voice reminds me of scraping my teeth on a chalk board. Is there any way I can convince her that she jest can't sing? I'm so miserble, what do I do?