Final answer:
Guido d'Arezzo's contribution to musical notation was the development of the staff notation system, enabling accurate music notation and preserving music styles.
Explanation:
Guido d'Arezzo contributed to musical notation by developing a system of lines and spaces known as the staff notation, which enabled musicians to notate specific notes in a melody accurately. This advancement in music notation allowed for the preservation, distribution, and evolution of music styles over the past thousand years.
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