I'm mostly a self-taught musician. I took piano lessons for several years as a kid and still know my way around a keyboard. I'm not an expert, but I read music pretty well, can sight read a vocal piece with some accuracy, can usually tell if I'm sharp or flat, and love to invent harmonies when I'm singing with other people. I'm not much on the discipline of singing with a choral group, but I do love making music.
However, I've never known how it all fits together. My formation of chords has always been seat-of-the-pants; I've had no idea of the logic of music, just an intuitive sense of what sounds right. When I was a kid, I learned to peck out a tune on the piano and find what bass chords or notes went with the melody notes I was playing. I could see that there were patterns but had no understanding of why.
This course changed all that for me. I was fascinated to learn what the structure of music is. It's not a science, but it is rational. It's not fantasy but it is non-rational. Does that make sense? Music brings rationality and non-rationality together in one place. Like great painting, music has patterns that are highly rational and yet create something beyond rationality.
Listening to Dr. Greenberg's lively lectures, the piano examples and visuals he provided, and hearing the passages chosen for their relevance to the material presented has filled in many of the blanks in my understanding of how music works. This has been a great experience.