Parkinson's disease involves many motor difficulties as well as non-motor ones. Recent research has strongly suggested that exercise is very important for Parkinson's disease. We are interested especially in dance as a form of exercise, because it combines physical movements with balance tasks, social engagement, and mental stimulation. Therefore, we think dance classes may be a very beneficial exercise for Parkinson's disease; the purpose of this study is to see if Argentinean Tango classes might improve motor and non-motor manifestations of Parkinson's disease.