Good article and actually having audio to illustrate the things the author talks about is helpful. For people interested in diving into this concept more deeply, there's a whole theoretical/analytical approach around musical expectation that was developed back in the 90s by Eugene Narmour: The Implication-Realization model (http://en.wikipedia.org/wiki/Implication-Realization). Interestingly enough, it looks like the predictive power of the model holds up pretty well when tested in the real world: http://www.erin.utoronto.ca/~w3psygs/SchellenbergCognition.p...

I've been out of the music theory game for a while, so I don't know if anyone's doing much with the I-R model anymore, but it's a fascinating approach to music analysis.