\documentclass[11pt]{article}
\input musixtex
\usepackage{a4wide,mtxdoc,multicol,charter} 
\def\LBR{{\tt\char'173}}                
\def\Bslash{\tt\char'134} 
\def\Flat{{\musixfont\char'062}}
\def\Sharp{{\musixfont\char'064}}    
\def\mtxSharp{\mbox{\raise1ex\hbox{\Sharp}}}
\def\mtxFlat{\mbox{\raise1ex\hbox{\Flat}}}    
\begin{document}
\setcounter{page}{1}
\pagebreak
\renewcommand{\thepage}{I-\arabic{page}}
If you can't find what you need here, also try the Table of Contents.
Other sources of help are listed in Appendix A. 

\input mtxdoc.ind
\end{document}