Students learn about the variables that affect pitch. They pluck a string and observe what happens to the pitch as the length and tension of the string change. Then they compare the pitch of sounds produced by plucked rubber bands of different widths. They look inside a stringed instrument to see how the instrument is able to produce a wide variety of pitched notes. Finally, they tap glass bottles ﬁlled with varying amounts of water and see how the amount of water in the bottles affects the pitch of the sound produced.