<span>If one scans topics and pages of Leonardo da Vinci's notebooks, it becomes apparent that he kept them strictly for his own use. The correct answer is D. He never intended to actually publish those works, at least until he achieved definitive results in what he was studying. He wanted to experiment a lot and was interested in many scientific things, many of which could be found in his notes.</span>
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Joseph Haydn<span>, in full </span>Franz Joseph Haydn, (born March 31, 1732, Rohrau, Austria—died May 31, 1809, Vienna), Austrian composer who was one of the most important figures in the development of the Classical style in music during the 18th century. He helped establish the<span>The young Haydn sang in the church choir, learned to play various instruments, and obtained a good basic knowledge of music. But his life changed decisively when he was eight years old. The musical director of St. Stephen’s Cathedral in Vienna had observed the boy on a visit to Hainburg and invited him to serve as chorister at the Austrian capital’s most important church. Haydn’s parents accepted the offer, and thus in 1740 Haydn moved to Vienna. He stayed at the choir school for nine years, acquiring an enormous practical knowledge of music by constant performances but, to his disappointment, receiving little instruction in music theory. He had to work hard to fulfill his obligations as a chorister, and when his voice changed, he was expelled from both the cathedral choir and the choir school.</span> forms and styles for the string
