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. (A working example is included in the README file.)

The author is Émile Daneault.