But it won't do to sketch it.

Every note has got to be there; Chopin didn't write them by accident.

He knew quite well what he was about.

Begin again, please." This time Michael got not quite so far, when he was stopped again.

He was playing without notes, and Falbe got up from his chair where he had the book open, and put it on the piano.
"Do you find difficulty in memorising ?" he asked.
This was discouraging; Michael believed that he remembered easily; he also believed that he had long known this by heart.
"No; I thought I knew it," he said.
"Try again." This time Falbe stood by him, and suddenly put his finger down into the middle of Michael's hands, striking a note.
"You left out that F sharp," he said.