Studies have come out showing correlation between loud noises such as working at a nightclub, frequenting rock concerts, and air traffic controllers and higher rates of heart disease. Recently and for the past seven years, groups of ravers have been putting this to the test. Take a look at the link below. Loud techno music is apparently to blame for the deaths of two dolphins at the recent Connyland Swiss amusement park.
It is believed that the loud music led to a high amount of stress, which eventually led to the catastrophic deaths of both dolphins.