Sorry for the late reply.
> this is my first time contacting a FOSS project so please forgive me > (and tell me) if i'm missing some protocol here. I've been using > LilyPond for a few years now, absolutely love it and have recently > started using it in Emacs instead of Frescobaldi. But one thing i'm > still missing is the live compile-preview-update feature of > frescobaldi: Whenever i save the changes to my *.ly file, the file > is automatically compiled and the integrated pdf preview is updated. > > I could not find this feature in the officially provided > lilypond-mode for Emacs and thus, i implemented it on my own. Would > you be interested in me creating a pull request to the official > GitLab repo in order to integrate this as an optional feature > (e.g. a minor mode; analogous to > [latex-preview-pane](https://github.com/jsinglet/latex-preview-pane))? The LilyPond mode, as currently distributed with LilyPond, is rather unmaintained; AFAICS, the future is Saul Tobin's 'lilypond-ts-mode' https://github.com/shevvek/lilypond-ts-mode which provides much better parsing for both LilyPond and Scheme code in the same file, so please try this and make suggestions there. Werner