Music has been helping people stay happy and express themseleves for years. Music is generally defined as the art of arranging sound to create some combination of form, harmony, melody, rhythm or otherwise expressive content. Music often plays a key role in social activities, religious rituals, rite of passage ceremonies, celebrations, and cultural activities. The music industry includes songwriters, performers, sound engineers, producers, tour organizers, distributors of instruments, accessories, and sheet music. Compositions, performances, and recordings are assessed and evaluated by music critics, music journalists, and music scholars, as well as amateurs.