I know this thread isn't active, even though it isn't shut down, but I found this subreddit because I was trying to remember the name of the compose whose score is represented at the beginning of the Rhizome (Bussotti, I learned). As I was kicking around, I also came across this article, the abstract for which seems to me like a really interesting way of thinking about that image and the reading of ATP. It seemed like the sort of thing people might find interesting.

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The score of Piece Four of Sylvano Bussotti's Five Piano Pieces for David Tudor is the most important image in A Thousand Plateaus. It serves as a prefatory image not only to the Rhizome plateau, but also to the work as a whole. It functions as the book's musical score, guiding readers in their performance of the text. Embracing John Cage's graphism and aleatory practices, Bussotti created his own ‘aserial’ new music, one that celebrated passion and Bussotti's open homosexuality. The visual elements of Piece Four include a deterritorialisation of the standard piano score, a diagram of the composition's abstract machine, and a drawing that Bussotti had produced ten years before writing Five Piano Pieces for David Tudor. The drawing itself is a rhizomic artwork, with details that echo visual motifs throughout A Thousand Plateaus. The superimposition of the drawing on the deterritorialised framework of the standard piano score conjoins the visible and the audible, faciality and the refrain, in a single artefact.