Day: June 4, 2017

You can debug your source code by playing a MIDI file generated by LilyPond. Just insert a \midi block inside a \score block.

\score {
  \new StaffGroup <<
    \new Staff << \global \violineOne >>
    \new Staff << \global \violineTwo >>
  >>
  \layout { }
  \midi {
    \tempo 2 = 90
  }
}