 Okay, here's what I want you to do. Imagine that you're sitting in front of an auditorium, and you're asked to perform for a room full of people by tapping out a tune for everyone to hear. The tune should be something that you think everyone would know. A few examples that most people would know from North America, Australia, or the UK might be Twinkle, Twinkle, Little Star. Ba-ba-black sheep, or rain drops keep falling on my head. Now imagine that you're standing in Matt's position, and that there's a hundred people watching you perform in front of this auditorium. I want you to estimate how many of the 100 listeners would be able to name the tune that you're tapping. Okay, so go to the next section and enter a number between 0 and 100.