\ifx\undefined\music \else \endinput \fi

\immediate\write10{MusiXLaTeX T.61\space<25 September 1996>}%

\newenvironment{music}{\@afterindenttrue\parskip0pt\catcodesmusic
  \resetlayout}{}%

\ifx\musix@begindocument\undefined
  \let\musix@begindocument\document
  \def\document{\musix@begindocument
    \ifstartmuflex@done\else\startmuflex\fi}%
\fi    

\endinput