I think the comments here are responding negatively to the title of the post. True, you're probably not going to spend the rest of the day coding to the music you make in incredibox. But this app is still very cool for what it is: a fun, easily accessible experiment in making music with loops.

I put together a couple of little songs that sounded pretty cool, and the experience was simple and enjoyable. I give props to whoever made Incredibox, and think this general direction is promising for casual music making, an activity that could benefit all of us.