The goal of this clinical trial is to compare to rhythm-based walking interventions to enhance gait in people with Parkinson's disease. The main questions it aims to answer are:

• How does rhythm-based training influence walking performance?
• How does brain activity change following rhythm-based training? Participants will perform walking to music and walking while singing, and will train on the use of these rhythms for 12 weeks. The investigators will compare the effects of training with music to training with singing.

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

Data for individual participants available by request. Only de-identified data will be shared and only for individuals who consent to have their data shared with people who are not part of the original research team.

From enrollment to end of follow-up, up to 20 weeks.

Participants were asked about adverse events on a weekly basis during the period of the intervention. Any reported events were then documented on a standardized adverse events form that allowed us to collect information about the nature, severity, and relatedness of the event as well as any treatment received. Any open adverse events were followed up on each week during the period of intervention and each conversation again documented with an adverse event follow up form.

Nothing to report