Lullatone is a Japan-based duo who make childlike pajama-pop that sounds like baby raindrops getting ready for bed. Now with their Raindrop Melody Maker, you can make some of your own -- just start clicking raindrops. After a couple of seconds the sounds will start to loop, eventually leading you to ask yourself "How exactly did I do this?" If you like to keep time with a metronome, just click the green circle on the bottom. You'll get the hang of it pretty quickly.