Older adults diagnosed with a serious mental illness (SMI) often face a lifetime of psychiatric institutionalization, making them a very vulnerable population. However, music therapy research has not been conducted with this specific population. The purpose of this thesis was to develop an evidence-based proposed music therapy program for geriatric patients diagnosed with SMI utilizing both music-based and non-music based theoretical frameworks. The music-based approach used for the program is Dalcroze and the non-music based approach is Wellness with a focus on quality of life. The population diagnosed with SMI and the complications of aging for this population are discussed as well as the results of previous music therapy studies conducted with adults diagnosed with SMI. The components of the Dalcroze and Wellness approaches are described and the elements that are incorporated into the program include improvisation and eurhythmics and client strengths and the physical domain (movement). The proposed music therapy program will have the therapeutic goals of increased social interaction, increased self-esteem, and increased quality of life. The data collection tools are mentioned and how to measure results. The program is described in detail with session plans consisting of warm-up, improvisation, movement, and closing interventions. The recommendations for clinical evidence-based practice are discussed.