+@itemx --lily-loglevel=@var{loglevel}
+Set the output verbosity of the invoked @command{lilypond} calls to
+@var{loglevel}. Possible values are @code{NONE}, @code{ERROR},
+@code{WARNING}, @code{BASIC_PROGRESS}, @code{PROGRESS}, @code{INFO}
+(default) and @code{DEBUG}. If this option is not used, and the
+environment variable @code{LILYPOND_LOGLEVEL} is set, its value is used
+as the loglevel.
+
+