Draw at least eight shapes, including a circle, square, rectangle, triangle, and four organic shapes. In your shapes, practice shading, blending, or any of the other techniques you learned using charcoal or pastels. Your drawing should include at least two techniques for the medium you chose.

i think it's about 10 mins.

actually i think that's wrong, but i don't know how to delete this.

but who knows it might be right.

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.