lilypond-usage: Updating files with convert-ly

 
 2 Updating files with ‘convert-ly’
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 The LilyPond input syntax is routinely changed to simplify it or improve
 it in different ways.  As a side effect of this, the LilyPond
 interpreter often is no longer compatible with older input files.  To
 remedy this, the program ‘convert-ly’ can be used for upgrading files to
 newer versions of LilyPond.
 

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