A singer is a person who uses his or her voice to produce music. Singers are often accompanied by musicians and instruments, while other people sing to have fun. Vocal skill is usually a combination of innate talent and professional training. Singers are also referred to as vocalists. A lead singer performs the primary vocals of a song, as opposed to a backing singer who sings backup vocals or harmonies. Professional singers usually undergo voice training, provided by a voice teacher or coach.