Simplified Music Notation is a notation system in which the usual
accidentals symbols are replaced with noteheads of different shapes.
Double sharps, double flats and sharps and flats produced by playing
white notes on the piano (e.g. B sharp and E sharp) are notated using
“history signs.”

For more information about Simplified Music Notation, visit
<http://www.simplifiedmusicnotation.org/>
