This type of drawing aims to identify and react to the main visual and expressive characteristics of form.

what do you want  in this there is nothing i dont get it

The correct answer is gesture drawing.

Explanation:

A drawing gesture is an imposition of the action, form and pose of a model / figure. Typical situations involve an artist drawing a series of poses taken by a model in a short period of time, often only 10 seconds or up to 5 minutes. Gesture drawing is often done as a warm-up for a life drawing session, but it is a skill that must be cultivated by itself.

In less typical cases, the artist may be observing people or animals doing normal activities without a special effort to stop the artist. For example, draw people on the street, artists, athletes or draw animals in the zoo.

The main objective of gestural drawing is to facilitate the study of the human figure in motion. This exploration of the action is useful for the artist to better understand the efforts of the muscles, the effects of torsion on the body and the natural range of movement in the joints. Basically, it is a method of hand training to draw what the brain has already seen. Staying "focused" means a sustained concentration. Gesture drawings can take as long as two minutes, or as short as five seconds, depending on the focus of the exercise.

it seems to me that yes they solo on the chord changes.  coltrane for sure solos on the chord changes. instead of changing scales, they use a different method over the chord changes. this melody is very  unique but may often times even be considered simple, which is quite common in this modal  type. for example, there are changes from the key of minor to major in this piece, which makes it  unique in its own way.