That lecture I hadn't found. (I've listened to others of his, in parts.) He really does explain it well, though by the time he gets to Bach I can both appreciate the mathematics everyone always talks about with respect to music, and at the same time begin to find myself slipping from understanding.

Even when I studied piano, which I did enthusiastically as a kid (even learning by leaps and bounds, until I had to quit because my practice interfered with dad's sports and news, the piano being in the same room as the TV), I saw no relation whatsoever to math, because I understood all chords, and keys, and relations between them, in terms of colors.