A housefly hums in the key of F

The airborne pest commonly known as the housefly actually gives people an a cappella show. While they lack vocal cords they still make noises and those noises are always created in the key of F. All insects actually lack vocal cords, but many of them can make sounds. Insects create noises either through rubbing your legs together, using a vibrating membrane, or vibrating their wings. Houseflies create noise through vibrating their wings.