Click the green flag
I started with one sprite bouncing around the stage and changing costumes. I duplicated this sprite twice. I did not realize that the conditionals that change their colors would be "True" when the sprites are touching each other (duh). Then I decided to add random "music" to the touching. I discovered that the notes and the color change/movement had to be in different scripts or else the sprites stopped moving after each step while the note played. The scale is G major in case you were wondering. I need to tinker some more with the speed the sprites are moving to see if the "music" could be a little more pleasing to the ear.