Tommy is playing notes on the piano keyboard. Some notes are high-pitched, and some notes are low-pitched. Where on the piano are the high-pitched keys?

You know a lot already about energy but did you know that sound is made by energy? You know how we hear sounds. Not all sounds are the same, of course. Some sounds are loud and some are soft. Sounds have different pitches. Some are high and some are low. Musical instruments can play different notes.