The idea for Harmonia came to me in 1997, just two years after I joined the composition/theory faculty at the University of Illinois. At UIUC all composers teach theory, and as the newest faculty member I was assigned to teach first-semester theory and aural skills. While I had taught similar courses in the past, during the preceding decade I had actually been working outside academia, as a computer researcher, first at the Price-Waterhouse Technology Centre in Menlo Park, CA and then for five years at the Zentrum für Kunst und Medientechnologie in Karlsruhe, Germany. What struck me most about teaching theory again was that — though the content I was teaching had changed very little — the circumstances in which I was teaching was very different than anything I had previously experienced.