Order "elements" (music loops and rests) to make a song. It's (hopefully) easy to add more loops. Click the "See inside" button, add the loop's name (which must not be just a number) to the LOOPS list, and add the loop as a sound to the "Play song button" sprite. Thanks to @Monkey_Legend for posting the idea "make your own song" here: https://scratch.mit.edu/discuss/topic/217830/ I'm not sure if he meant "make a make your own song project", but oh well. The loops are all from the sound library. Why does Scratch make lists bigger whenever I reload the page? :(