How hard is a piece of music: exhibit A

The trouble with grading a piece of piano music is that one has to agree that certain things that one can do on the piano should be learned in a particular order.  The traditional view is that the easiest music is where the thumbs share middle C and only white notes are played. Oh yes, and the rhythm should be a simple sequence of crotchets. Meantime, school kids from all ends of the globe gather around classroom pianos to teach each other a sequence of tonic chords (moving around the keyboard, in a swing groove) to be played in duet with a friend playing a melody that requires shifts in hand position (or, I suppose, turning over the thumb) and an extension beyond the five-finger position. And nearly every school child with access to a piano seems to be able to learn this feat of keyboard skill. Should we be taking a new look at what makes a piece of

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