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 Scribble has been presented in duo and trio formats at global festivals and venues.
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