Sound therapy

This demonstrates how music, relaxation talk or nature sounds can improve ones mood or mindset. Alternatively, music with negative emotional messages or certain classical music can adversely affect the listeners' emotional state. Hypnosis widely uses it to deeply engage with the patients.

Depression
Studies have shown, that psychological therapy that included music therapy improved depression recovery results.

Communication
Listening to music rewires the brain for an improvement of communication skills, even if brain damage is the issue. Politicians use it to control the crowd, and turn them into their ways.

Playing music
Playing musical instruments has been shown to improve mental functioning.