If you need to compile an LilyPond file (.ly, .ily) to pdf, you will need a compiler on LilyPond Official Website. Download and install it, you can find the compiler (In Windows, it's at
C:/Program Files/LilyPond/usr/bin/lilypond.exe
on default).
Features
Support LilyPond syntex highlighting.
Support compile and auto-compile.
No support for pdf viewing. So you may find a pdf viewer plugin for viewing.
Extension Commands and Settings
Commands
extension.lilypond-workshop.compile(LilyPond Workshop: Compile): compile LilyPond file now
Settings
extension.lilypond-workshop.compilerPath: path of LilyPond compiler (lilypond.exe)
extension.lilypond-workshop.compileOnSave: enable auto-compile on save