Some things make a sound.
There are lots of sounds here.

A thing that makes a sound is called a sound source.
How many sound sources can you find?
Your voice is a sound source.
Fadi is using his ears to listen to sounds.
What can he hear?

What will you hear if you do this?
Try it. Close your eyes to help you listen.
Where do the sounds come from?
Try listening again. Do you hear anything different?