Neurological impairments following a brain injury can be in the form of apraxia — loss to perform purposeful movements, dysarthria , muscle control disturbances due to damage of the central nervous system , aphasia defect in expression causing distorted speech , or language comprehension. A Tarantella Comes to Newfoundland. Practitioners are registered with the Health Professions Council and, starting from , new registrants must normally hold a master's degree in music therapy. Both techniques use systematic processes where the therapists assist the client by using musical experiences and connections that collaborate as a dynamic force of change toward rehabilitation. Walter Reed Army Medical Center and the Office of the Surgeon General worked together to lead one of the earliest assessments of a music therapy program.