\documentclass[a4paper, 12pt]{article}

\twocolumn
\begin{document}

\section{A latex file with two columns}

In this example, the width autodetection should detect the two-column
settings in the preamble of the document and produce snippets that
have the width of a column.

\begin{lilypond}
\score{
  \relative c'{c d e f g a b c | c, d e f g a b c | c, d e f g a b c}
}
\end{lilypond}

Wraping at the end of a column is similar to wraping at the end of a
page.

Text text text text text text text text text text text text text text
text text text text text text text text text text text text text text
text text text text text text text text text text text text text text
text text text text text text text text text text text text text text
text text text text text text text text text text text text text text
text text text text text text text text text text text text text text
text.

Text text text text text text text text text text text text text text
text text text text text text text text text text text text text text
text text text text text text text text text text text text text text
text.

\begin{lilypond}
\score{
  \relative c'{c d e f g a b c | c, d e f g a b c | c, d e f g a b c}
}
\end{lilypond}

\end{document}