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Pop-superstar Adele was recently forced to cancel the remainder of her tour due to voice damage for the second time in five years. Her latest voice setback has prompted a vigorous debate on social media about vocal health. Voice doctors, teachers and gurus are trying to explain why so many stars are currently having voice problems. The list of voice to do’s and don’ts is extensive: from famed Soprano Shirley Verret becoming a loner on show days to preserve silence, to stories of legendary tenor Franco Corelli having his wife hold a cross to his larynx in order to obtain…