I would be Musicing wrong a lot! I loved it when he said that. Never took a class, so I have no idea about some of what he is saying. I gleaned about 1/10th of it, maybe. Could not answer any of the questions after the first 2. I am ok with the melodies and relative pitch. All that 18th century chord stuff hurts my head.
Don't feel bad, I took lots of classes and that type of chord notation is simply archaic.
I could notate them, but writing their 'correct' chord would be an utter waste of time here. Nobody could read it once you were done!