New stop button added! Randomize button added! Repeat sound checkbox added! Something's not working. Press the green flag and click the play buttons to play different sounds. If you look on the left side of each of the play button, it tells you what music that play button will play if you click on it. (I know this is very obvious.) This application only uses one sprite. I guess it used to have two sprites but I fixed it so that it uses clones for the play button and the songs. It needs the only variable "id" to be "only for this sprite" for the project to identify the sprite's clones.
Thanks @SparshG for the cloning guide in the MinOS - Refined and Minimal forum thread and the 40% of the art.