Do chickens like music in the coop?
Some evidence in Australia and New Zealand has indicated that music may help to keep chickens calm and happy, thus helping them to grow larger, faster. The relationship to egg laying rate has not been seen on a large scale (that I am aware of). You might be interested to read this article about music as related to growth in chickens in Taiwan.
This is also an often used science project for kids, too. For example, you can read the results of one such science project in a PDF to see what other kids have done.
If you decide to try a similar science project, let us know your results!