Sing For Your Saunter Part 2 R33

Inclusion Criteria: 1. at least 30 years of age 2. diagnosis of idiopathic, typical Parkinson disease according to the UK Brain Bank Criteria 3. Hoehn \& Yahr stages 2-3 (mild to moderate disease severity) 4. evidence of walking impairment (score at least 1 on gait item of MDS\_UPDRS) 4\) stable on all Parkinson disease medications for at least 2 months prior to study entry 5) willing and able to provide informed consent 6) right-handed Exclusion Criteria: 1. diagnosis of any other neurological condition 2. a score of 2 or greater on item # 3 on the freezing of gait questionnaire 3. significant cognitive impairment 4. unstable medical or concomitant illnesses or psychiatric conditions which, in the opinion of the investigators, would preclude successful participation 5. cardiac problems that interfere with ability to safely participate 6. orthopedic problems in the lower extremities or spine that may limit walking 7. contraindications for magnetic resonance imaging 8. unable to walk for 10 continuous minutes independently 9. left-handed 10. uncontrolled tremor or dyskinesia