Victoria,
Many thanks for the references.  There are a number of studies on dairy
cows in regard to making milking stress-free.  My brother went to Cornell
for dairy science and most of the barns he worked in had a radio with music
playing to keep the cows calm during milking.  They even had particular
radio stations they kept to because the cows did better on certain music. 
Of course humans aren't cows but certainly stress has the potential to impact
a milk supply in humans. 
Valerie W. McClain, IBCLC
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