This is informative and entertaining, and quite funny. I really liked the part about raising one's eyebrows to indicate a deceptive cadence. That really cracked me up. It reminds me of one time when someone at church asked me how I could hit the high notes when I'm leading singing. I told them, "I stand on my tiptoes." Which is partly a joke, and partly the literal truth.*
*But since I'm a tenor, hitting the high notes isn't that hard. The low notes are what really tear my voice up.