How does it know?
Ok. So it isn't always genius, but it has been fairly incredible in my life thus far. It will never fully replace the hand-picked mixed tape effect of decades past, insofar that it lacks the love, but it does do the job swiftly... Which is real helpful when you need to write a paper, or clean the house, or any other similar task and would like a little music to help you in your endeavor, but realize that spending and hour or two putting together a playlist would really undermine what you're trying to accomplish.
Thanks fruity computer system. You're awesome.