In 1757, Haydn became the music director for Count Morzin, where he wrote music and conducted a private orchestra. This role significantly impacted his development as a composer. His work with Count Morzin laid the groundwork for his later success. ;
Haydn became the music director for Count Morzin in 1757, where he wrote music and conducted a private orchestra. This position was essential for his development as a composer and laid the groundwork for his future success. Therefore, the correct answer is C. Count Morzin.
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