This experiment lets you explore the natural mathematical relationship between a string’s length and its pitch. Several strings are available to play, with each being divided into different lengths.

This tool lets you explore how the shape of a wave can change the sound it makes. You can choose from four different waveforms including square, sawtooth, triangle, and sine. When you click (or touch) from the top to the bottom of the screen, the wave will play from high to low.

This tool is a simulation of an old-time piano roll. You can play the music and see the notes scroll by. There are different songs to choose from and instruments to play.

This tool lets you play notes in a harmonic series, which is a set of frequencies with a simple relationship, such as twice as fast, three times as fast, four times, and so on. This can lead to an exploration of musical intervals, octaves, and major chords.

This experiment allows you to explore how frequency affects pitch. First you can use the recording provided, or you can use your mic to record yourself. Then using the controls at the bottom, or by clicking and rotating the sound waves, you can play the sound fast or slow, forward or backwards.