Convert Lilypond to MusicXML

Reference: https://music.stackexchange.com/questions/42315/lilypond-to-musicxml-to-sibelius

• Clone this project to your local machine https://github.com/openlilylib/oll-core
• Clone this project to your local machine https://github.com/openlilylib/lilypond-export
• Set the include path for lilypond to point to the parent folder which contains the two projects above. In Frescobaldi this can be done by opening Preferences > Lilypond Preferences
• Add the following lines at the top of the file:

  \include "oll-core/package.ily"
  \loadPackage lilypond-export
  
  opts.exporter = #exportMusicXML
  

• Update the \layout command to be like so:

  \layout{
      \FileExport #opts
  }
  

Now when running the file through Lilypond it should also produce a .xml file. I find the results to be better than the output from python-ly.