\documentclass{article}
\thispagestyle{empty}
\usepackage[generate,ps2eps]{abc}

% --- M-Tx support
\newenvironment{mtx}[1][]
{\renewcommand{\normalabcoutputfile}{out-mtx}%
\abc[program=musixtex,options={-g},extension=mtx,#1]}
{\endabc}
\newcommand{\mtxinput}[2][]{%
\abcinput[program=musixtex,options={-g},extension=mtx,#1]{#2}}

% --- PMW support
\newenvironment{pmw}[1][]
{\renewcommand{\normalabcoutputfile}{out-pmw}%
\abc[program=pmw,options={-includefont},extension=pmw,#1]}
{\endabc}
\newcommand{\pmwinput}[2][]{%
\abcinput[program=pmw,options={-includefont},extension=pmw,#1]{#2}}

\begin{document}

This document includes music excerpts written in different formats. It
uses \texttt{abc.sty} and defines new environments.

This is a short piece, typeset by M-Tx:

\mtxinput{sample-mtx}

The same piece, typeset by PMW:

\pmwinput{sample-pmw}

End of document.

\end{document}