The sections were then sent to friends, musicians and onlookers to paint or scribble on.
en.wikipedia.org The main techniques used in drawing are: line drawing, hatching, crosshatching, random hatching, scribbling, stippling, and blending.
en.wikipedia.org Often these manuscripts are roughly sketched, with drafting work scribbled over the top of the music, and have been found in unordered piles.
en.wikipedia.org In one case an antonymic suffix has been proposed, a laudatory "-el-," which would contrast with pejorative "-a-: skribo" writing, "skribao" scrawl, scribbling, "skribelo" calligraphy.
en.wikipedia.org