Bored...... Eh, have fun messing around with it.
Demo song = Suna No Oshiro (Might sound weird online. If so, just keep pressing the button until it sounds normal.)
LOL, the first time I typed "Demo Song" I had a typo and typed "Demon Song". xD
Try typing your name or something. :> My last name makes the first part of the Animal Crossing theme song. xD
"Play Random" just makes it play some creepy tune with a random instrument and random notes. (I've tried it like, 20 times now and all of them were very creepy.)