My favorite (or favorite moment) is "Orchestration 2" - The part where he is first talking, then showing in his template how it works/sounds, experimenting, discussing and trying different ideas, playing it/recording it so it is clear what effect it has. Making music.
Orchestration 3 and Rythm and Perc have him recording examples in his DAW. I don't know the other classes on that list.I have my eye on:
Orchestration 3 - presets
Rythm and perc