CTAN directory: /macros/latex/contrib/piano

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Contents of README

This package adds the \keyboard[1][2]..[7] command to your
project. When used, it draws a small 2 octaves piano keyboard on your
document, with up to 7 keys highlighted.

Keys go : Co, Cso, Do, Dso, Eo, Fo, Fso, Go, Gso, Ao, Aso, Bo, Ct,
Cst, Dt, Dst, Et, Ft, Fst, Gt, Gst, At, Ast and Bt.

Suggested use :
\begin{figure}[thpb]\
  \centering
  \keyboard[Co][Eo][Gso][Ct][Et]
  \caption{C aug chord}
  \label{Chord1}
\end{figure}