is the organizing principle in music and refers to a musical work's structure and shape.

The answer is form

Explanation:

Form is the structure and shape of musical work

i would say the answer is b. zigzag lines of the leaves. i believe this is the answer because zigzag lines go in different direction while the other options like: the vertical lines of the trees, the dotted lines on the road, and the curved lines of the park benches go in one direction.

the style of music that was composed during the classical era was concerto grosso.