Here’s an article that claims that chickens grow better if provided with music.
Is it true? Do chickens do better if they have the ability to put on an impromptu hoedown anytime the mood strikes them? Beats me, but no doubt there’s been research on the subject. Any poultry question that (a) comes up over and over and (b) can be researched cheaply has been looked into: our Extension Service is like that. And it’s not like putting a radio in a chicken house is very complicated.
I do know that chickens make noises to communicate with each other, and a contented flock sounds different from an unhappy flock. They also react to noises in their environment. So it seems reasonable that appropriate background music will mellow them out.