I was going to use some piano music, but Space Pirates by Waterflame just felt right. It's just to show how simple the Fourier transform is. See inside and see the Fourier transform sprite (unless you saw my tutorial and are already convinced that it is ReallySimple™). Go to turbowarp and hold space while clicking the green flag to show more bars, spaced out by the 12th root of 2 like keys on a piano rather than 1.5, (7 keys on a piano): https://turbowarp.org/1365058822 The oscilloscope is just a graph of the values in the .wav file (the air pressure made when the music was recorded / to be made when its played) The bars are the Fourier transform for various frequencies of a 20ms chunk of them.