Feline behavioural stress is triggered by their acute sensitivity to sounds in the environment. Cats can hear from 40Hz to 85,000 Hz, which is more than three times higher than human hearing, at 20Hz-20,000Hz. To modify behavioural stress in cats, Janet Marlow, Founder of Pet Acoustics and Dr. Asaf Dagan at PetPace LTD show the benefits of this, calming music has been repeatable and observable since its use for cats starting in 1997. To further understand the calming effects of this music, a study was initiated to analyse the biometrics of cats while listening to the music.