Which composer is given credit for inventing chant notation on a staff?

Guido D’Arezzo

Explanation:

    The music theorist, Guido d'Arezzo (992 - 1050) was an Italian monk and conductor of the choir of the Cathedral of Arezzo, Tuscany, having bequeathed a more advanced musical notation to the West. It is due to him, in particular, the name of the notes - ut, ré, mi, fa, sol, lá, si - based on a hymn to Saint John in Latin, as well as the musical score - the pentagram - in force until the our days. In addition, he was the real initiator of solfeggio, an exercise to learn to read notes, usually marking the compass with his hand.

variety in color and variety in texture

based on the images pictured above, the major difference between the two cathedrals: the cathedral of notre dame and the amiens cathedral, is that the cathedral of notre dame emphasizes the horizontal lines while the amiens cathedral emphasizes the vertical lines.