As I wrote recently, I’ve been working on using LilyPond to produce attractive and readable shamisen sheet music. It’s not all been for my own purposes, though. I’ve used it to put together a free collection of traditional pieces that I have learned, so that others can benefit from more readable scores.
All the pieces are available as PDFs and LilyPond source files for editing, reformatting, or reuse under a Creative Commons licence.
You can find them at shamisen.space.