LaTeX poem style

input-poem.tex

\documentclass{article}

\usepackage{verse}

\begin{document}

\begin{verse}
\poemlines{3}
\setverselinenums{1}{3}
In a cavern, in a canyon, \\
Lived a miner, forty-niner, \\
And his daughter, Clementine. \\   % Produces 3. Required 1.
Oh my darling, Oh my darling, \\
Thou art lost and gone forever, \\
Oh my darling Clementine. \\       % Produces 6. Required 2.
\end{verse}

\end{document}

poem.txt

In a cavern, in a canyon,
Lived a miner, forty-niner,
And his daughter, Clementine.    1.
Oh my darling, Oh my darling,
Thou art lost and gone forever,
Oh my darling Clementine.        2.

solution-with-verse.tex

\documentclass{article}

\usepackage{verse}

\begin{document}

\begin{verse}
In a cavern, in a canyon, \\
Lived a miner, forty-niner, \\
And his daughter, Clementine. \\   % Produces 3. Required 1.
Oh my darling, Oh my darling, \\
Thou art lost and gone forever, \\
Oh my darling Clementine. \\       % Produces 6. Required 2.
\end{verse}

\begingroup
\makeatletter \def\thepoemline{{\count1\c@poemline \divide\count1by3 \@arabic\count1}} \makeatother
\begin{verse}
\poemlines{3}
In a cavern, in a canyon, \\
Lived a miner, forty-niner, \\
And his daughter, Clementine. \\   % Produces 3. Required 1.
Oh my darling, Oh my darling, \\
Thou art lost and gone forever, \\
Oh my darling Clementine. \\       % Produces 6. Required 2.
\end{verse}
\endgroup

\end{document}

solution.tex

\documentclass{article}
\usepackage{fancyhdr}
\usepackage{poemscol}

\begin{document}

\begin{poem}
\setverselinemodulo{1}
\begin{stanza}
In a cavern, in a canyon, \\
Lived a miner, forty-niner, \\
And his daughter, Clementine. % Produces 1.
\end{stanza}
\begin{stanza}
Oh my darling, Oh my darling, \\
Thou art lost and gone forever, \\
Oh my darling Clementine. % Produces 2.
\end{stanza}
\end{poem}
\end{document}