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The \cadenzaOn Lilypond command for creating unmetered music[1] does not work. For instance, the following (fairly minimal) snippet throws an error:

     <score>\relative c' { \cadenzaOn c1 \cadenzaOff }</score>

Messages:

     Unable to compile LilyPond input file:

     Processing `.../file.ly'
     Parsing...
     Interpreting music... 
     warning: cannot find or create `Timing' called `'
     warning: cannot find or create `Timing' called `'
     Preprocessing graphical objects...
     Interpreting music... 
     warning: cannot find or create `Timing' called `'
     warning: cannot find or create `Timing' called `'

     exited with status: 139

1. http://lilypond.org/doc/v2.17/Documentation/notation/displaying-rhythms#unmetered-music