The final two variations from my "30 Variations on an Aria by J.S. Bach": Capriccio IV and Quodlibet. The Capriccio is maybe the most flashy piece in the set. The "Quodlibet" is a mashup of various phrases from five well-known chorale tunes. They are easy to see in the music but a few tunes are a bit harder to pick out by ear. Can you name them all?