"Oh no! This is evil!" This was the reaction of two teenagers sightreading the final variation of Mozart's Theme and Variations for piano four-hands. After pages of interchanged triplets and thirty-seconds suddenly out of nowhere sixteenths! The nerve.

They couldn't get over how all this trickery emerged from such a "dinky-sounding" theme.

Hard? Sure. But better than hard is provoking, and best of all is laughter-provoking.