Did anybody think while I was playing, "Why is he using so many impulses?" If I'd done this with my head you certainly would have thought it. (Music) (Music ends) And for the rest of your life, every time you hear classical music, you'll always be able to know if you hear those impulses. So let's see what's really going on here. We have a B. This is a B. The next note is a C. And the job of the C is to make the B sad. And it does, doesn't it? (Laughter) Composers know that. If they want sad music, they just play those two notes.