This works, but there's actually a much nicer way to make music in SmileBASIC! Try running this: BGMPLAY "CDEFGAB<C" This uses Music Macro Language, or MML. If you type in "MML" and press the ? button, it will give you information on all the commands you can use. You can also use BGMSET or BGMSETD to assign MML to a BGM number, and then play it back on demand with BGMPLAY #.