Plot: 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. At once the most fundamental component of a song and the most challenging to capture, the vocal track is the product of a complex collaboration between performer, producer, and sound engineer--a titrate of artistic commitment, compelling concept, and technical wizardry that, at its best, turns a lyric into the soul of the song