Inhale and exhale breath through the nose, pharynx, larynx, trachea, bronchi, lungs, chest, and diaphragm. When the ribs open and the diaphragm contracts and stretches downward, the chest expands and the lungs expand to inhale the breath. The opposite is to exhale the breath, and the exhalation of the breath is the driving force for singing and making sounds. Sound is produced by the vibration of the vocal cords by the breath.