The human ear cannot hear everything.

Dogs, for example, can here high frequencies far better than humans, while a ant can even hear a worm crawling through the earth.

A healthy human ear can hear sounds between 20 Hertz and 20 kiloHertz. At least, if you have not  incurred significant damage to your hearing, or are not somewhat older. As people age, their hearing deteriorates. This is part of the normal ageing process.

Look at the infographic below: (source: Sonic Electronix) which explains how music is measured, how long it takes before you incur damage to your hearing,  the 10 loudest sounds, the loudest concerts in the world, etc…