Answer:
Ottaviano Petrucci is known for inventing a type setting system for printing music sheets. He was wrongfully identified as the first person to print music sheets (Harmonice Musices Odhecaton in 1501) but it was Ulrich Han who did it in 1476 with his Missale Romanum.
But Petrucci's printing system was much more advanced, complex and commonly used, making Petrucci famous.
