Some cats like to walk on and “play” pianos, while others come running when they hear a harmonica or whistle. Cats are quite vocal and can have a significant repertoire of sounds that may be accidentally mimicked when you sing and when certain notes are struck on various musical instruments. Some sounds may mimic mating or distress calls and even sounds of various prey that trigger the hunting instinct.
Cats are known for not being the most affectionate pets and this cat is a prime example. This cat freaks out when its owner starts singing, check the video and decide for yourself if he really hates her or is just worried that there is something wrong about her.