In the summer of 1767, when Mozart was eleven, they started on a new tour, for which the little prodigy composed four pianoforte concerti, which were interesting on account of certain harmonic effects produced in them, but that second tour, was not a fortunate one, for during it, both Nannerl and Wolfgang were stricken with small-pox, which took a very violent form, and poor Wolfgang lay blind for nine days, and convalescence was slow, and hard to bear. Again they visited Vienna, but there they found things greatly changed, for while in former days, music was always a feature of great social gatherings, now the only pleasure seemed to be in balls, and there was absolutely no interest shown in Mozart, the child prodigy. Also much jealousy was shown towards the Mozarts by other musicians, and when Wolfgang set to work on an opera, to be used with the text written for him by the Viennese dramatic poet of the day, and had already completed a score of six hundred and fourteen pages, it was said that Wolfgang had not written it at all, that it was his father's composition. To contradict these statements, in the presence of several prominent critics, Leopold opened a volume of Metastatio, at the first aria, which he placed in front of Wolfgang, and before that assemblage of critical older men, the boy seized a pen and wrote without hesitation, music to the aria for several instruments, and with such incredible swiftness that the company watching him were dumb with amazement at his ability. But matters did not grow brighter--all sorts of unpleasant incidents occurred to embitter the tourists, and at the end of a year the family returned once again to Salzburg. At that time Italy was the Mecca of the musician, and to study and win his first laurels there was the ideal of every musical student. The musical atmosphere of Salzburg was narrow and provincial, and Leopold Mozart wished Wolfgang to escape from it, so presently we find young Mozart and his father journeying Southward to Italy where Wolfgang is studying, meeting interesting people, playing in public, and writing amusing letters home to Nannerl, who was becoming more devoted to her home duties now, than to her music, but even so it was always into her ears that Wolfgang poured his musical feelings, sure that he would be understood. When he was in Rome, he saw in the Sistine chapel the painting of "The Last Judgment," while listening to the wonderful music of "The Miserere," which music is only performed in Holy Week by the Pope's choir, and no one has ever been allowed to have a copy of the music or even to see it. But so accurate was little Mozart's memory, that after leaving the chapel, he not only wrote out the music correctly, but could also sing it perfectly, a feat which made him the musical marvel of his age!