Not only is the voice the principal means of human communication, but it was undoubtedly the first musical instrument. The human voice falls into six ranges: soprano, mezzo-soprano, contralto, tenor, baritone and bass. The singing voice produces a wide variety of pitches, offers complex tonality and even has percussive capacity.Vocal music is probably the oldest and most natural form of music, and every type of musical culture utilize some form of choral music. Studies have shown that singing boosts your confidence, lowers stress levels, improves mental alertness, strengthens the immune system, and can even improve your posture.