Can you actually show it(if possible) so we can get an idea of the answer???
Its either
a. negative
c. backgrounds
The answer is a the material of a work of art
The answer is : staff lines. He devised an arrangement of lines and spaces that developed into the musical staff. Two of Guido D'Arezzo's primary contributions to music history
: 1. developed a 4-line staff circa. 1025
2. wrote a text on music ca. 1026 called "Micrologus"
