How to compile Lilypond files using Emacs?

Hello, I would like to ask a question about using Lilypond with Emacs. According to the online documentation it is possible to use Lilypond with Emacs: https://lilypond.org/doc/v2.18/Documentation/usage/text-editor-support.html#emacs-mode The problem is that I cannot get it to work and I would a

Is it possible to import scores generated by Lilypond to other softwares?

Hello, Recently, I've started learning Lilypond (I'm completely a newbie in this field). I'm impressed by the excellent quality of the scores one can produce via Lilypond. I was wondering whether it is possible to import scores generated by Lilypond to professional softwares allowing to play music