Guido of Arezzo

Guido of Arezzo was an influential music theorist and educator in the 11th century. He is best known for developing the system of musical notation that laid the foundation for modern Western music. His innovations included the use of a four-line staff and the introduction of note names derived from the hymn "Ut queant laxis." This helped musicians read and write music more easily. Guido's work, particularly his treatise "Micrologus," revolutionized music education and made it more accessible, allowing for the preservation and transmission of musical works across generations. His contributions remain significant in the study of music theory today.