Is it true that when cows listen to music, it makes them happy and they produce more milk? If so, how does it work?

Question: Is it true that when cows listen to music, it makes them happy and they produce more milk? If so, how does it work?
- Keywords:
  animal,
  cow,
  milk,
  music
Asked by anawesomepersonlol to Rob, Kate on 25 Jun 2013.
- Robert Woolfson answered on 25 Jun 2013:
  
  So I’ve done a bit of searching and I can’t find anything to suggest this is more than an urban legend. A lot of farmers seem to believe this is true, for cows and for chickens (to lay eggs). However, there don’t seem to be any studies out there that I can actually take a look at.
  
  Speaking of animals and music:

Question: Is it true that when cows listen to music, it makes them happy and they produce more milk? If so, how does it work?