The power of music:
As a therapy to reduce pain. many studies mention soft music can lower the level of moderate to mild pain.

Encouragement.
certain music can make you more enthusiastic and more focused on what you do.

Relaxation
traditional music like using a gamelan with a soft accompaniment can help you be more relaxed. even in some spa spots play this music when customers enjoy the spa therapy provided.

Stimulates brain development
classical music when played on a baby when in the womb is believed to stimulate brain development for the better.

Music as one of torture therapy
I've read an article that mentions a certain music playing repeatedly played over and over while interrogating someone to get tortured and frustrated and finally open his mouth.