art and music?!

i've been thinking a lot lately about improvisation in different areas of the arts. specifically painting. probably because i'm a painter. duh.
anyway, they more i think about it, the closer it seems to the improvisational music i'm playing these days.
my typical process for my current works is almost always as follows: first i draw out the vaguest drawing of the objects that i can. this is a thin black line on white paper - no gradation, no space, no texture, or color. very very basic. then i put the same outline onto the canvas or other surface that i might be working on. from there i start to fill in the blankness with color and texture and light and ideas and a number of other things i can't think of at the moment. this process is almost exactly that of how i have been playing music.
the vague black line is a quick conversation or idea before we start playing. this is usually with the group i'm in deciding on something very plain like a key or idea. not much information. then we fill in the blanks! we start filling in the white space with sounds instead of paints. the most interesting thing for me to do in either situation is to react. every action - brush stroke, color choice, or tone or rhythm - is a reaction to what happened before. they are almost identical in their process. i adjust to the last action, whether i want to compliment it or counteract it, both can be interesting.