We just heard the bell ring and it should have sounded different. We will find out that sounds are louder nearer the source of the sound and that sound travels in all directions. That means that everyone heard the drum beat. The sound of the drum beat traveled to all of you at the same time. That is because vibrating objects produce sound.
All sound is produced by the vibration of matter.
Matter may vibrate after absorbing energy. When sound reaches our ears, our eardrums and connected tiny bones vibrate. Sounds may be high or low. This is called pitch. Objects that vibrate quickly make sounds with high pitch.