Cats hear better than people and dogs due to a hearing range of 45 to 64,000 Hertz. This means that cats can hear sounds both lower and higher than we can.
If you are randomly bellowing out into song when your cat is nearby, you might be frightening them, not with a pitch but rather the unexpectedness of it.
• Start quietly before increasing your volume• Associate your singing with gentle touch if your cat is a cuddler • Include your kitty’s name in the song