standard \cup vs musixtex's \cup

Question

I'm using the musixtex package and it contains a \cup command (command for a dotted note). Unfortunately, I need the usual \cup command (command for the union of sets).

Now, LaTeX doesn't recognize the 'normal' \cup command and gives me an error.

What could I do to solve the problem?

Answer 1

The definition of of \cup can be stored in other macros, see the example. In this case the \cup of musixtex is probably not used in math mode, thus a "switcher" macro \cup can be defined that uses the mathematical \cup in math mode and the \cup of musixtex otherwise:

\documentclass{article}

\let\mathcup\cup
\usepackage{musixtex}
\let\musixcup\cup

\DeclareRobustCommand*{\cup}{%
  \ifmmode
    \expandafter\mathcup
  \else
    \expandafter\musixcup
  \fi
}

\begin{document}
  \noindent
  Musical note: \musixcup 0 \qquad \cup 0\\
  Math: $A \mathcup B = A \cup B$
\end{document}