A new study out of the University of Lisbon in Portugal found that the music you play can really affect your cat, enough to stress it out and maybe even give it health problems.

When the researchers played "Thunderstruck" by AC/DC, the cats showed the most signs of stress, like fast breathing and dilated pupils.

The opposite effect happened when they played some nice classical music, "Adagio For Strings" by Samuel Barber, it completely calmed them down.

Their reaction to a pop song "Torn" by Natalie Imbruglia, was in the middle. The researchers say it could be useful for veterinary clinics who want to calm cats down during surgery or for people who have new cats with behavior problems.