If vintage video games don't soak up enough of your Monday, give Google's Song Maker a try. The interface is a big grid, in which each block represents a specific sound, whether its a melodic tone or piece of a drum kit. When you click play, a line moves across the grid, triggering each sound as it goes, which creates a musical loop. You can make some impressive and complex compositions if you know what you're doing. Of course, I made a total cacophonous wreck that sounds like a bunch of angry babies got loose in a Guitar Center. But, it sure is fun.