Question: William Vennard, was a famous American vocal pedagogist, Vennard introduced contemporary scientific research in the areas of human anatomy and physiology into the study of singing, the shift in approach led to the rejection of many of the beliefs and practices held since the bel canto era, most particularly in the areas of what, which term used for a range of tones in the human voice produced by a particular vibratory pattern of the vocal folds?
{'answer': 'vocal register', 'supporting_facts': [['William Vennard', 3], ['Vocal register', 0]]}