Example: Guitar chords

% Guitar chords
% Author: Christoph
% Source: http://rio.eta-ori.net/latex-chords/chords.sty
%         http://rio.eta-ori.net/latex-chords/example.tex
\documentclass{article}
\usepackage{subfig}
\usepackage{tikz}
%% Code from chords.sty
% Counters
\newcounter{chords-string}
\newcounter{chords-fret}

% Variables
\newcommand{\chordreset}{
  \def\chordtuning{E,A,D,G,B,E}
  \def\chordfretstart{1}
  \def\chordfretend{4}
}
\chordreset

% The chord environmant
% \begin{chord}
% \begin{chord}[D,G,D,G,H,E]
\newenvironment{chord}
{
  % A single note
  % \single <string> <fret> <finger>
  \newcommand{\single}[3]{
    \draw node[single] at (##1,##2) {##3};
  }
  % A bar
  % \bar <startstring> <fret> <finger>
  \renewcommand{\bar}[3]{
    \draw[bar] (##1,##2) -- node[midway] {##3} (1,##2);
  }
  % No strike
  % \nostrike <string>
  \newcommand{\nostrike}[1]{
    \draw[nostrike] (##1,\chordfretstart-.5) +(-135:.2cm) -- +(45:.2cm);
    \draw[nostrike] (##1,\chordfretstart-.5) +(135:.2cm) -- +(-45:.2cm);
  }
  \begin{tikzpicture}[
    single/.style={draw,circle,fill=white},
    bar/.style={cap=round,double,double distance=18pt},
    nostrike/.style={line width=.8mm},
    cm={0,-0.8,1,0,(0,0)}
  ]
  \setcounter{chords-string}{6}
  \foreach \tuning in \chordtuning
  {
    \node at (\value{chords-string},\chordfretstart-1) {\tuning};
    \addtocounter{chords-string}{-1}
  }
  \draw[yshift=-0.5cm] (1,\chordfretstart) grid (6,\chordfretend+1);

  \foreach \fret in {\chordfretstart,...,\chordfretend}
  {
    \setcounter{chords-fret}\fret
    \draw node at (0,\fret) {\Roman{chords-fret}};
  }
}
{
  \end{tikzpicture}
}

%% End of chords.sty file

\begin{document}

\begin{figure}
\subfloat[F major]{
\begin{chord}
  \bar 6 1 1    % bar from 6th string down with index finger on 1st fret
  \single 5 3 3 % ringfinger on 5th string 3rd fret
  \single 4 3 4 % pinky on 4th string 3rd fret
  \single 3 2 2 % index on 3rd string 2nd fret
\end{chord}
\chordreset}
%
\subfloat[D major bared]{
\def\chordfretstart{5} % start diagram at 5th fret
\def\chordfretend{8}   % end diagram at 8th fret
\begin{chord}
  \bar 5 5 1
  \single 2 7 4
  \single 3 7 3
  \single 4 7 2
  \nostrike 6 % do not strike 6th string
\end{chord}
\chordreset}
\end{figure}

\end{document}