The instructor ushered the boy into the room and motioned him to sit before the piano. A manuscript of Brahms was placed before the boy. "Play", said the instructor. The boy sat in silence, staring anxiously at the sheet music. "Play", said the instructor again, this time more firmly.
All the elements were certainly there. The sheet music was written for the piano. The notes were clearly visible on the page. The boy's eyes were able to perceive the notes. Nerves connected the boy's brain to his hands - in fact, the boy had excellent motor control. The piano was in working condition and well tuned. Moments ago, another young man had played this very concerto on this same piano, and played it well.
"Play!", the instructor demanded again. But yet again, the boy sat in silence. He could not do as the instructor asked, as he had never touched a piano before in his life. "How sad", the instructor pontificated. "You will never know the thrill of mastery, the power to touch the souls of your audience through your performance, and the resultant elation. Why would I ever bother to teach someone such as yourself?"