Celebrating the most powerful of all instruments––the human voice––the third episode of Soundbreaking surveys the range of ingredients that go into a perfect vocal track. Featuring rare studio footage of some the world’s most renowned vocalists––from blues divas to suave crooners to rock star screamers––the show considers the gamut of tricks and techniques that can both enhance and alter the human voice, and explores the ineffable emotional quality that makes a vocal track truly great.