Note: LilyPond releases can contain syntax changes, which may
require modifications in your existing files written for older
versions so that they work in the new version. To upgrade files,
it is strongly recommended to use the convert-ly
tool distributed with LilyPond, which is described in
Updating files with convert-ly. convert-ly can
perform almost all syntax updates automatically. Frescobaldi users can
run convert-ly directly from Frescobaldi using
“Tools > Update with convert-ly…”. Other editing
environments with LilyPond support may provide a way to run
convert-ly graphically.