This research presents the design and control of a mechatronic assistant for the treatment with music therapy in dementia patients, in emphasis on Alzheimer's disease, through control software implemented in a mechatronic system. The development of research shows that the proposed mechatronic system detects and records the behavior of brain waves, through communication in order to perform some corrective action against a possible unwanted unforeseen response during therapy. This communication can be in real time by communicating via Bluetooth through an application to a family member or patient manager and regulates the musical style according to the type of brain wave that best effects the patient with dementia and additionally, with a cloud record for further analysis of the improvement and progress of the patient. With this, the implemented mechatronic assistant will improve the well-being and quality of life of dementia patients.