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This article reviews speech and voice disorders accompanying idiopathic Parkinson's disease. Data are summarized that document laryngeal, respiratory, articulatory, velopharyngeal, and sensory kinesthesia disorders in this population. Medical and behavioral treatments are identified. The rationale, fundamental concepts, treatment techniques. and outcome data are presented for the Lee Silverman Voice Treatment (LSVT) an effective program for treating speech and voice disorders m individuals with idiopathic Parkinson's disease.