The world of classical music is atwitter at the discovery of piano compositions written by Mozart at age 8. The Times of London reports that the four-minute concerto and one-minute prelude must have been played by the boy, but notated by his father Leopold. A representative of the International Mozarteum Foundation in Salzburg said, "You break into a sweat if you try to imitate what this boy could play when he was 8 or 9 years old." The pieces were found in a notebook of music that Leopold created for Mozart's five-year-old sister. Researchers realized that the musical structure of the pieces was not in-keeping with Leopold's style, and additional documentation backed up the work as that of Mozart. According to the Mozarteum representative, the concerto is "an important link between the miniature pieces in the Notenbuch and the great forms of Mozartian instrumental works" that occupied the composer from 1763.