Music therapy is the use of music to improve health or functional outcomes. Music therapy is a creative arts therapy, consisting of a process in which a music therapist uses music and all of its facets—physical, emotional, mental, social, aesthetic, and spiritual—to help clients improve their physical and mental health. Music therapists primarily help clients improve their health in several domains, such as cognitive functioning, motor skills, emotional development, communication, sensory, social skills, and quality of life by using both active and receptive music experiences such as improvisation, re-creation, composition, and listening and discussion of music to achieve treatment goals. There is a wide qualitative and quantitative research literature base. Some commonly found practices include developmental work (communication, motor skills, etc.) with individuals with special needs, songwriting and listening in reminiscence/orientation work with the elderly, processing and relaxation work, and rhythmic entrainment for physical rehabilitation in stroke victims. Music therapy is also used in some medical hospitals, cancer centers, schools, alcohol and drug recovery programs, psychiatric hospitals, and correctional facilities.