In Part Two of 'The Voice Box' Clarissa Dunn delves into the styles of some of the most intriguing vocal virtuosi from opera singers to yodellers to beat boxers: those artists who've taken the vocal instrument to physical and imaginative extremes.
Learn the secret of operatic resonance. Discover the reality of being a castrato (the most enigmatic of vocal virtuosi) and find out why birds are so inspiring.
Hear the vocally schizophrenic Cathy Berberian, the ingenious Bobby McFerrin, the extraordinary Yma Sumac and acclaimed German yodeller Franzl Lang.
We also meet Jonny Marks, the Kiwi who dedicated a year of his life to fine tuning his throat singing technique in China.