This was our 23rd lesson together!
The cover features the great Heinrich Schenker, the one who analyzed music like no one before him.
Let me also quickly explain frame no. 1: The joke here is that “Es ist genug”, which means “it is enough” in German, is the opening line of Bach’s Cantata No. 60, Movement 5 chorale. I’ve been looking at that chorale for like 4 months now!