If you've ever wondered what keeps you listening to music, you may have the answers in the book Sweet Anticipation by David Huron. Huron proposes that your sense of expectation plays a large role in music, and he outlines a range of aesthetic responses that are created by expectation. If you'd like to hear a bit more about this interesting theory, it is discusssed in a podcast on a new website devoted to music cognition (Sound and Mind). To listen, click here. You can also read more new ideas about our brain's appreciation for music in this Boston Globe article.